2026/07/31 更新

写真a

イズミヤマ ショウタ
泉山 将大
IZUMIYAMA Shota
所属
素粒子宇宙起源研究所 フレーバー物理学国際研究センター 特任助教
職名
特任助教

研究分野 1

  1. 自然科学一般 / 素粒子、原子核、宇宙線、宇宙物理に関する実験  / ヒッグスの物理

 

論文 39

  1. Overview of ATLAS muon detectors: status and performance 国際共著 国際誌

    Izumiyama S.

    Proceedings of Science   485 巻   2026年3月

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    担当区分:筆頭著者, 最終著者, 責任著者   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Proceedings of Science  

    The ATLAS Muon Spectrometer, the largest muon system ever built at colliders, now comprises both the legacy gaseous detectors-Monitored Drift Tubes, Thin Gap Chambers, and Resistive Plate Chambers-which have been in operation for over 15 years, and newer technologies like Micromegas and small-strip TGCs in the New Small Wheel. These new systems are now in stable operation, following an extensive phase of construction and commissioning, and they provide enhanced muon tracking and trigger capabilities. This paper presents the status and performance of the muon system.

    Scopus

  2. Finalization of the Sector Logic ATCA blade design for the ATLAS Level-0 muon trigger at HL-LHC 査読有り 国際共著 国際誌 Open Access

    Izumiyama, S

    JOURNAL OF INSTRUMENTATION   21 巻 ( 2 )   2026年2月

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    担当区分:筆頭著者, 最終著者, 責任著者   記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1088/1748-0221/21/02/C02029

    Web of Science

  3. Combined effective field theory interpretation of measurements sensitive to quartic gauge boson couplings in pp collisions at s=13 TeV with the ATLAS detector Open Access

    Aad G., Aakvaag E., Abbott B., Abdelhameed S., Abeling K., Abicht N.J., Abidi S.H., Aboelela M., Aboulhorma A., Abramowicz H., Acharya B.S., Ackermann A., Adam Bourdarios C., Adamczyk L., Addepalli S.V., Addison M.J., Adelman J., Adiguzel A., Adye T., Affolder A.A., Afik Y., Agaras M.N., Aggarwal A., Agheorghiesei C., Ahmad A., Ahmadov F., Ahuja S., Ahuja S., Ai X., Aielli G., Aikot A., Ait Tamlihat M., Åkesson T.P.A., Akiyama D., Akolkar N.N., Aktas S., Alberghi G.L., Albert J., Alberti U., Albicocco P., Alderweireldt S., Alegria Z.L., Aleksa M., Aleksandrov I.N., Alexa C., Alexopoulos T., Alfonsi F., Algren M., Alhroob M., Ali B., Ali H.M.J., Ali S., Alibocus S.W., Aliev M., Alimonti G., Allaire C., Allbrooke B.M.M., Allen D.R., Allen J.S., Allen J.F., Alley C.S., Almazan E.R., Aloisio A., Alonso F., Alpigiani C., Alvarez Fernandez A., Alves Cardoso M., Alviggi M.G., Aly M., Amaral Coutinho Y., Amelung C., Amerl M., Amezza T., Amini B., Amirie K., Amirkhanov A., Amperiadou D., An S., Anastopoulos C., Andeen T., Anders J.K., Anderson A.C., Andreazza A., Angelidakis S., Angerami A., Anisenkov A.V., Annovi A., Antel C., Antipov E., Antonelli M., Anulli F., Aoki M., Aoki T., Aparo M.A., Aperio Bella L., Apicella M., Appelt C., Apyan A., Arampatzi M., Arbiol Val S.J.

    Physics Letters Section B Nuclear Elementary Particle and High Energy Physics   879 巻   2026年8月

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    出版者・発行元:Physics Letters Section B Nuclear Elementary Particle and High Energy Physics  

    A combination of measurements sensitive to anomalous quartic electroweak gauge boson couplings is presented using proton–proton collision data collected by the ATLAS detector at s=13 TeV at the LHC. Contributing analyses include measurements of vector-boson scattering in numerous final states as well as a tri-boson measurement. The combined measurement is used to constrain anomalous electroweak boson quartic self-couplings that result from dimension-8 operators in the Éboli model using an effective field theory. Results are presented as 68% and 95% confidence level intervals parameterised by one or two Wilson coefficients, both with and without unitarity constraints applied. Theoretical bounds from unitarity and positivity are overlaid where relevant. Confidence intervals obtained from simultaneous profiled fits to all Wilson coefficients are also presented.

    DOI: 10.1016/j.physletb.2026.140683

    Open Access

    Scopus

  4. Search for Diffuse Supernova Neutrino Background with 956.2 Days of Super-Kamiokande Gadolinium Dataset Open Access

    Abe K., Abe S., Asaoka Y., Harada M., Hayato Y., Hiraide K., Hosokawa K., Hung T.H., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakahata M., Nakayama S., Noguchi Y., Pronost G., Sato K., Sekiya H., Shinoda R., Shiozawa M., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Itow Y., Kajita T., Nishijima R., Okumura K., Tashiro T., Tomiya T., Wang X., Fernandez P., Labarga L., Samudio D., Zaldivar B., Yanagisawa C., Kearns E., Mirabito J., Wan L., Wester T., Pointon B.W., Bian J., Cortez B., Griskevich N.J., Jiang Y., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Jang M.C., Lee S.H., Moon D.H., Park R.G., Yang B.S., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Le Blévec E., Drapier O., Ershova A., Ferey M., Mueller T.A., Santos A.D., Paganini P., Quach C., Rogly R., Nakamura T., Jang J.S., Litchfield R.P., Machado L.N., Soler F.J.P., Learned J.G., Choi K., Cao S., Anthony L.H.V., Prouse N.W., Scott M., Uchida Y., Berardi V., Calabria N.F., Catanesi M.G., Ospina N., Radicioni E., Langella A., De Rosa G., Collazuol G., Feltre M., Mattiazzi M., Ludovici L., Gonin M., Périssé L., Quilain B.

    Astrophysical Journal   1005 巻 ( 1 )   2026年7月

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    出版者・発行元:Astrophysical Journal  

    We report the search result for the Diffuse Supernova Neutrino Background (DSNB) in neutrino energies beyond 9.3 MeV in the gadolinium-loaded Super-Kamiokande (SK) detector with a 22,500 × 956.2 m<sup>3</sup> day exposure. Starting in the summer of 2020, SK introduced 0.01% gadolinium (Gd) by mass into its ultrapure water to enhance the neutron capture signal, termed the SK-VI phase. This was followed by a 0.03% Gd-loading in 2022, a phase referred to as SK-VII. We then conducted a DSNB search using 552.2 days of SK-VI data and 404.0 days of SK-VII data through 2023 September. This analysis includes several new features, such as two new machine learning neutron detection algorithms with Gd, an improved atmospheric background-reduction technique, and two parallel statistical approaches. No significant excess over background predictions was found in a DSNB spectrum-independent analysis, and 90% confidence level (C.L.) upper limits on the astrophysical electron antineutrino flux were set. Additionally, a spectral fitting result exhibited a ∼1.2σ disagreement with a null DSNB hypothesis, comparable to a previous result from 5823 days of all SK pure-water phases.

    DOI: 10.3847/1538-4357/ae6c20

    Open Access

    Scopus

  5. Search for massive, long-lived particles in events with displaced vertices and displaced muons in <i>pp</i> collisions at √<i>s</i>=13.6 TeV with the ATLAS experiment Open Access

    Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, NJ; Abidi, SH; Aboelela, M; Aboulhorma, A; Abramowicz, H; Acharya, BS; Ackermann, A; Bourdarios, CA; Adamczyk, L; Addepalli, SV; Addison, MJ; Adelman, J; Adiguzel, A; Adye, T; Affolder, AA; Afik, Y; Agaras, MN; Aggarwal, A; Agheorghiesei, C; Ahmad, A; Ahmadov, F; Ahuja, S; Ai, X; Aielli, G; Aikot, A; Tamlihat, MA; Åkesson, TPA; Akimov, AV; Akiyama, D; Akolkar, NN; Aktas, S; Alberghi, GL; Albert, J; Alberti, U; Albicocco, P; Alderweireldt, S; Alegria, ZL; Aleksa, M; Aleksandrov, IN; Alexa, C; Alexopoulos, T; Alfonsi, F; Algren, M; Alhroob, M; Ali, B; Ali, HMJ; Ali, S; Alibocus, SW; Aliev, M; Alimonti, G; Alkakhi, W; Allbrooke, BMM; Allen, JS; Allen, JF; Alley, CS; Almazan, ER; Aloisio, A; Alonso, F; Alpigiani, C; Fernandez, AA; Cardoso, MA; Alviggi, MG; Aly, M; Coutinho, YA; Ambler, A; Amelung, C; Amerl, M; Amezza, T; Amini, B; Amirie, K; Amirkhanov, A; Amperiadou, D; An, S; Anastopoulos, C; Andeen, T; Anders, JK; Anderson, AC; Andreazza, A; Angelidakis, S; Angerami, A; Anisenkov, AV; Annovi, A; Antel, C; Antipov, E; Antonelli, M; Anulli, F; Aoki, M; Aoki, T; Aparo, MA; Bella, LA; Apicella, M; Appelt, C; Apyan, A; Arampatzi, M; Val, SJA; Arcangeletti, C; Arce, ATH; Arguin, JF; Argyropoulos, S; Arling, JH; Arnaez, O; Arnold, H; Artoni, G; Asada, H; Asatryan, S; Asbah, NA; Pickering, RAA; Aslam, AM; Assahsah, J; Assamagan, K; Astalos, R; Astrand, KSV; Atashi, S; Atkin, RJ; Atmani, H; Atmasiddha, PA; Augsten, K; Auriol, AD; Austrup, VA; Avad, AS; Avolio, G; Axiotis, K; Azzam, A; Babal, D; Bachacou, H; Bachas, K; Bachiu, A; Bachmann, E; Backes, MJ; Badea, A; Baer, TM; Bahmani, M; Bahner, D; Bai, K; Baines, L; Baker, OK; Gupta, DB; Balabram, LE; Balakrishnan, V; Balasubramanian, R; Balek, P; Ballabene, E; Balli, F; Baltes, LM; Balunas, WK; Balz, J; Banas, E; Bandieramonte, M; Bandyopadhyay, A; Bansal, S; Barak, L; Barakat, M; Barberio, EL; Barberis, D; Barbero, M; Barel, MZ; Barillari, T; Barisits, MS; Barklow, T; Baron, P; Moreno, DAB; Baroncelli, A; Barr, AJ; Barr, JD; Barreiro, F; da Costa, JBG; Teixeira, MGB; Bartels, F; Bartoldus, R; Barton, AE; Bartos, P; Baselga, M; Bashiri, S; Bassalat, A; Basso, MJ; Bataju, S; Bate, R; Bates, RL; Batlamous, S; Battaglia, M; Battulga, D; Bauce, M; Bauckhage, L; Bauer, P; Bayer, LT; Hurrell, LTB; Beau, T; Beaucamp, JY; Beauceron, S; Beauchemin, PH; Bechtle, P; Beck, HP; Becker, K; Beddall, AJ; Bednyakov, VA; Bee, CP; Beemster, LJ; Begalli, M; Begel, M; Behr, JK; Beirer, JF; Beisiegel, F; Belfkir, M; Bella, G; Bellagamba, L; Bellerive, A; Bellgraph, CD; Bellos, P; Benaoumeur, I; Benchekroun, D; Bendebba, F; Benhammou, Y; Benkendorfer, KC; Beresford, L; Beretta, M; Kuutmann, EB; Berger, N; Bergmann, B; Beringer, J; Bernardi, G; Bernius, C; Bernlochner, FU; Bernon, F; Guardia, AB; Berry, T; Berta, P; Berti, A; Bertrand, R; Bethke, S; Betti, A; Beumker, TF; Bevan, AJ; Bezio, L; Bhalla, NK; Bharthuar, S; Bhatta, S; Bhattarai, P; Bhatti, ZM; Bhide, KD; Bhopatkar, VS; 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Buckley, AG; Bucko, J; Buhring, M; Bulekov, O; Bullard, BA; Buratovich, TO; Burdin, S; Burgard, CD; Burger, AM; Burghgrave, B; Burlayenko, O; Burleson, J; Burzynski, JC; Büscher, V; Bussey, PJ; But, O; Butler, JM; Buttar, CM; Butterworth, JM; Butti, P; Buttinger, W; Vazquez, CJB; Buzykaev, AR; Urbáan, SC; Cadamuro, L; Cai, H; Cai, Y; Cai, Y; Cairo, MA; Cairo, VMM; Cakir, O; Calace, N; Calafiura, P; Calderini, G; Calfayan, P; Calic, L; Callea, G; Caloba, LP; Calvet, D; Calvet, S; Toro, RC; Camarda, S; Munoz, DC; Camarri, P; Camincher, C; Campanelli, M; Camplani, A; Canale, V; Canbay, AC; Canonero, E; Cantero, J; Capocasa, F; Cappelli, P; Capua, M; Carbone, A; Cardarelli, R; Cardenas, JCJ; Cardiff, MP; Carducci, G; Carli, T; Carlino, G; Carlotto, JI; Carlson, BT; Carlson, EM; Carmignani, J; Carnelli, A; Carnesale, M; Caron, S; Carquin, E; Carr, IB; Carrá, S; Carratta, G; Martinez, CC; Carroll, AM; Cartalade, N; Casado, MP; Casolaro, P; Caspar, M; Cassinese, F; Castiglioni, WR; Castillo, FL; 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    PHYSICS LETTERS B   878 巻   2026年7月

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    出版者・発行元:Physics Letters Section B Nuclear Elementary Particle and High Energy Physics  

    A search is presented for massive long-lived particles in events featuring at least one displaced vertex and at least one displaced muon, using proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider from 2022 to 2024 at a centre-of-mass energy of 13.6 TeV. The data sample corresponds to an integrated luminosity of 164 fb<sup>−1</sup>. The analysis targets scenarios in which long-lived particles decay inside the ATLAS inner detector, resulting in a topology of at least one massive, displaced vertex (DV) with multiple associated tracks, and at least one muon with a large transverse impact parameter relative to the primary interaction point. The muon is not required to be associated with the DV. Two signal regions are defined by the transverse distance of the reconstructed DV from the interaction point. Background contributions are estimated by using fully data-driven techniques. No significant excess above the expected background is observed. Upper limits at 95% confidence level are set on the visible cross-section and on the production cross-sections of several benchmark models of R -parity-violating supersymmetry.

    DOI: 10.1016/j.physletb.2026.140509

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  6. Search for decays of the Higgs boson into pair-produced pseudoscalar particles decaying into τ<SUP>+</SUP>τ<SUP>-</SUP>τ<SUP>+</SUP>τ<SUP>-</SUP> using pp collisions at √<i>s</i>=13 TeV with the ATLAS detector Open Access

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    NEW JOURNAL OF PHYSICS   28 巻 ( 6 )   2026年6月

  7. Search for dimuon resonance in the 35 to 75 GeV mass range using 140 fb−1 of 13 TeV pp collisions with the ATLAS detector Open Access

    Aad G., Aakvaag E., Abbott B., Abdelhameed S., Abeling K., Abicht N.J., Abidi S.H., Aboelela M., Aboulhorma A., Abramowicz H., Acharya B.S., Ackermann A., Adam Bourdarios C., Adamczyk L., Addepalli S.V., Addison M.J., Adelman J., Adiguzel A., Adye T., Affolder A.A., Afik Y., Agaras M.N., Aggarwal A., Agheorghiesei C., Ahmadov F., Ahuja S., Ahuja S., Ai X., Aielli G., Aikot A., Ait Tamlihat M., Aitbenchikh B., Åkesson T.P.A., Akiyama D., Akolkar N.N., Aktas S., Alberghi G.L., Albert J., Alberti U., Albicocco P., Albouy G.L., Alderweireldt S., Alegria Z.L., Aleksa M., Aleksandrov I.N., Alexa C., Alexopoulos T., Alfonsi F., Algren M., Alhroob M., Ali B., Ali H.M.J., Ali S., Alibocus S.W., Aliev M., Alimonti G., Allaire C., Allbrooke B.M.M., Allen D.R., Allen J.S., Allen J.F., Alley C.S., Aloisio A., Alonso F., Alpigiani C., Alsolami Z.M.K., Alvarez Fernandez A., Alves Cardoso M., Alviggi M.G., Aly M., Amaral Coutinho Y., Ambler A., Amelung C., Amerl M., Amezza T., Amini B., Amirie K., Amirkhanov A., Amor Dos Santos S.P., Amperiadou D., An S., Anastopoulos C., Andeen T., Anders J.K., Anderson A.C., Andreazza A., Angelidakis S., Angerami A., Anisenkov A.V., Annovi A., Antel C., Antipov E., Antonelli M., Anulli F., Aoki M., Aoki T., Aparo M.A., Aperio Bella L., Apicella M., Appelt C.

    Journal of High Energy Physics   2026 巻 ( 6 )   2026年6月

     詳細を見る

    出版者・発行元:Journal of High Energy Physics  

    A model-independent search for low-mass resonances decaying into pairs of oppositely charged muons is presented. The analysis uses proton-proton collision data corresponding to an integrated luminosity of 140 fb<sup>−1</sup>, recorded by the ATLAS detector at the Large Hadron Collider between 2015 and 2018. The search targets hypothetical dimuon resonances in the invariant mass range from 35 GeV to 75 GeV. The modelling of this mass region is particularly challenging for conventional analytic background parameterisations. To address this, a Gaussian process regression technique is used to model the background. The dimuon mass spectrum is analysed for potential signals, and no statistically significant excess is observed. Upper limits at the 95% confidence level are set on the fiducial production cross-section of new resonances decaying promptly into muons, ranging from 20 fb to 110 fb, depending on the resonance mass. These results are further interpreted in the context of dark-photon and dark-matter-mediator models, leading to new constraints on their parameter spaces.

    DOI: 10.1007/JHEP06(2026)165

    Open Access

    Scopus

  8. Measurement of differential t-channel single top (anti)quark production cross-sections at 13 TeV with the ATLAS detector Open Access

    Aad G., Aakvaag E., Abbott B., Abdelhameed S., Abeling K., Abicht N.J., Abidi S.H., Aboelela M., Aboulhorma A., Abramowicz H., Abulaiti Y., Acharya B.S., Ackermann A., Adam Bourdarios C., Adamczyk L., Addepalli S.V., Addison M.J., Adelman J., Adiguzel A., Adye T., Affolder A.A., Afik Y., Agaras M.N., Aggarwal A., Agheorghiesei C., Ahmadov F., Ahuja S., Ahuja S., Ai X., Aielli G., Aikot A., Ait Tamlihat M., Aitbenchikh B., Åkesson T.P.A., Akimov A.V., Akiyama D., Akolkar N.N., Aktas S., Alberghi G.L., Albert J., Alberti U., Albicocco P., Albouy G.L., Alderweireldt S., Alegria Z.L., Aleksa M., Alexa C., Aleksandrov I.N., Alexopoulos T., Alfonsi F., Algren M., Alhroob M., Ali B., Ali H.M.J., Ali S., Alibocus S.W., Aliev M., Alimonti G., Alkakhi W., Allaire C., Allbrooke B.M.M., Allen D.R., Allen J.S., Allen J.F., Allport P.P., Aloisio A., Alonso F., Alpigiani C., Alsolami Z.M.K., Alvarez Fernandez A., Alves Cardoso M., Alviggi M.G., Aly M., Ambler A., Amelung C., Amerl M., Ames C.G., Amezza T., Amidei D., Amini B., Amirie K., Amirkhanov A., Amor Dos Santos S.P., Amos K.R., Amperiadou D., An S., Anastopoulos C., Andeen T., Anders J.K., Anderson A.C., Andreazza A., Angelidakis S., Angerami A., Anisenkov A.V., Annovi A., Antel C., Antipov E., Antonelli M., Anulli F., Aoki M.

    Journal of High Energy Physics   2026 巻 ( 5 )   2026年5月

     詳細を見る

    出版者・発行元:Journal of High Energy Physics  

    The production of single top quarks and top antiquarks via the t-channel exchange of a virtual W boson is measured in proton-proton collisions at a centre-of-mass energy of 13 TeV at the Large Hadron Collider. The full Run 2 data sample recorded with the ATLAS detector in the years 2015–2018 is used, corresponding to an integrated luminosity of 140 fb<sup>−1</sup>. The absolute and normalised production cross-sections are measured differentially as a function of the transverse momentum and absolute rapidity of the top quark and top antiquark. In addition, the ratio of top quark to top antiquark production cross-sections is measured. The measured distributions are compared with next-to-leading-order quantum chromodynamics predictions obtained with different combinations of matrix-element generators, parton-shower programs and proton parton distribution functions, as well as to next-to-next-to-leading-order calculations. Overall, good agreement is observed between the measurements and the theoretical predictions. For most measured distributions, the sensitivity to differences between the predictions is limited by the systematic uncertainties in the measurement. The measured differential distributions are also interpreted in an effective field theory approach to constrain the Wilson-Coefficient CQq3,1 associated with a four-quark operator. The interpretation accounts for the effect of the selection efficiency, which is altered significantly by non-zero contributions from CQq3,1.

    DOI: 10.1007/JHEP05(2026)174

    Open Access

    Scopus

  9. Precise measurement of the tt¯ production cross-section and lepton differential distributions in eμ dilepton events from s=13TeVpp collisions with the ATLAS detector Open Access

    Zwalinski L., Zormpa O., Zorbas T.G., Zografos A., Zoch K., Zoccoli A., Živković L., Ziolkowski M., Zinsser J., Zimine N.I., Zhukov K., Zhuang X., Zhu Y., Zhu Y., Zhu X., Zhu J., Zhou Y., Zhou Y., Zhou Y., Zhou N., Zhou H., Zhou B., Zhou B., Zhong D., Zheng Z., Zheng X., Zheng K., Zheng J., Zhemchugov A., Zhao Z., Zhao Z., Zhao Y., Zhao T., Zhao H., Zhang Z., Zhang Z., Zhang Z., Zhang Y., Zhang Y., Zhang Y., Zhang Y., Zhang T., Zhang S., Zhang R., Zhang P., Zhang L., Zhang L., Zhang J., Zhang J., Zhang G., Zhang D.F., Zhang B., Zerwas D., Zenz S., Ženiš T., Zenin O., Zenger D.T., Zeng H., Zeitnitz C., Zaplatilek O., Zanzottera R., Zang J., Zamora Saa J.A., Zambito S., Zakareishvili T., Zak Z.K., Zaio A., Zahir I., Zabinski B., Zaazoua M., Yue L., Yuan R., Yuan M., Yuan J., Yu Y., Young N.D., Young I.N.L., Young C., Young C.J.S., Yorita K., Yildirim T.P., Yexley M.R., Yeo B., Yeletskikh I., Yeh Y., Ye X., Ye S., Ye J., Yardley C.L., Yao W.M., Yang Y., Yang Y., Yang X., Yang X., Yang T., Yang S., Yang H.T., Yang H.J., Yan Z., Yan S.

    European Physical Journal C   86 巻 ( 5 )   2026年5月

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    出版者・発行元:European Physical Journal C  

    The inclusive top quark pair (tt¯) cross-section σtt¯ has been measured in proton–proton collisions at s=13TeV, using 140fb-1 of data collected by the ATLAS experiment at the Large Hadron Collider. Using events with an opposite-charge eμ pair and b-tagged jets, the cross-section is measured to be: (Formula presented.) where the uncertainties reflect the limited size of the data sample, experimental and theoretical systematic effects, the integrated luminosity, and the proton beam energy, giving a total uncertainty of 1.3%. The result is used to determine the top quark pole mass via the dependence of the predicted cross-section on mtpole, giving mtpole=172.8-1.7+1.5 GeV. The same event sample is used to measure absolute and normalised differential cross-sections for the tt¯→eμνν¯bb¯ process as a function of single-lepton and dilepton kinematic variables. Complementary measurements of eμbb¯ production, treating both tt¯ and Wt events as signal, are also provided. Both sets of differential cross-sections are compared to the predictions of various Monte Carlo event generators, demonstrating that the state-of-the-art generators Powheg MiNNLO and Powhegbb4l describe the data better than Powheghvq.

    DOI: 10.1140/epjc/s10052-026-15311-0

    Open Access

    Scopus

  10. Measurement of the Higgs boson production in association with top quarks in multilepton final states in pp collisions at s=13 TeV with the ATLAS detector Open Access

    Aad G., Aakvaag E., Abbott B., Abdelhameed S., Abeling K., Abicht N.J., Abidi S.H., Aboelela M., Aboulhorma A., Abramowicz H., Acharya B.S., Ackermann A., Adam Bourdarios C., Adamczyk L., Addepalli S.V., Addison M.J., Adelman J., Adiguzel A., Adye T., Affolder A.A., Afik Y., Agaras M.N., Aggarwal A., Agheorghiesei C., Ahmadov F., Ahuja S., Ahuja S., Ai X., Aielli G., Aikot A., Ait Tamlihat M., Aitbenchikh B., Åkesson T.P.A., Akiyama D., Akolkar N.N., Aktas S., Alberghi G.L., Albert J., Alberti U., Albicocco P., Albouy G.L., Alderweireldt S., Alegria Z.L., Aleksa M., Alexa C., Aleksandrov I.N., Alexopoulos T., Alfonsi F., Algren M., Alhroob M., Ali B., Ali H.M.J., Ali S., Alibocus S.W., Aliev M., Alimonti G., Alkakhi W., Allaire C., Allbrooke B.M.M., Allen D.R., Allen J.S., Allen J.F., Aloisio A., Alonso F., Alpigiani C., Alsolami Z.M.K., Alvarez Fernandez A., Alves Cardoso M., Alviggi M.G., Aly M., Ambler A., Amelung C., Amerl M., Ames C.G., Amezza T., Amini B., Amirie K., Amirkhanov A., Amor Dos Santos S.P., Amperiadou D., An S., Anastopoulos C., Andeen T., Anders J.K., Anderson A.C., Andreazza A., Angelidakis S., Angerami A., Anisenkov A.V., Annovi A., Antel C., Antipov E., Antonelli M., Anulli F., Aoki M., Aoki T., Aparo M.A., Aperio Bella L., Apicella M., Appelt C.

    Journal of High Energy Physics   2026 巻 ( 5 )   2026年5月

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    出版者・発行元:Journal of High Energy Physics  

    A measurement of the associated production of a top-quark pair with the Higgs boson (tt¯H) in multilepton final states is presented. The analysis is based on a data sample of proton-proton collisions at s=13 TeV recorded with the ATLAS detector at the CERN Large Hadron Collider and corresponding to an integrated luminosity of 140 fb<sup>−1</sup>. Six final states defined by the number and flavour of reconstructed charged leptons are combined in a simultaneous likelihood fit to extract the tt¯H signal and constrain the most relevant backgrounds. The measured tt¯H cross-section normalised to Standard Model (SM) prediction is σtt¯H/σSM=0.63−0.19+0.20. This result corresponds to an observed (expected) significance of 3.3σ (5.3σ). Additionally, two other fits are used to measure the tt¯H cross-section differentially in bins of the Higgs boson transverse momentum in the simplified template cross-section framework, and to extract the associated production cross-section of a single top-quark with the Higgs boson (tH) together with the tt¯H one. The CP structure of the top quark-Higgs boson Yukawa coupling is probed through an analysis of tt¯H and tH events. The results are compatible with the SM hypothesis, and values of the mixing angle between CP-even and CP-odd top-Higgs Yukawa couplings of |α| > 62<sup>°</sup> are excluded at 68% confidence level.

    DOI: 10.1007/JHEP05(2026)183

    Open Access

    Scopus

  11. Neutron-Multiplicity Measurement in Muon Capture on Oxygen Nuclei in the Gadolinium-Loaded Super-Kamiokande Detector Open Access

    Miki S., Abe K., Abe S., Asaoka Y., Bronner C., Harada M., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Mine S., Miura M., Moriyama S., Nakahata M., Nakayama S., Noguchi Y., Okamoto K., Pronost G., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Takenaka A., Tanaka H., Watanabe S., Yano T., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Megias G.D., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Yanagisawa C., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Cortez B., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Jang M.C., Lee S.H., Moon D.H., Park R.G., Yang B.S., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Ershova A., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quach C., Quilain B., Rogly R., Nakamura T., Jang J.S., Litchfield R.P., Machado L.N., Soler F.J.P., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Calabria N.F., Catanesi M.G., Radicioni E.

    Physical Review Letters   136 巻 ( 13 ) 頁: 131801   2026年4月

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    記述言語:英語   出版者・発行元:Physical Review Letters  

    In recent neutrino detectors, neutrons produced in neutrino reactions play an important role. Muon capture on oxygen nuclei is one of the processes that produce neutrons in water Cherenkov detectors. We measured neutron multiplicity in the process using cosmic ray muons that stop in the gadolinium-loaded Super-Kamiokande detector. For this measurement, neutron detection efficiency is obtained with the muon capture events followed by gamma rays to be 50.2-2.1+2.0%. By fitting the observed multiplicity considering the detection efficiency, we measure neutron multiplicity in muon capture as P(0)=24±3%, P(1)=70-2+3%, P(2)=6.1±0.5%, P(3)=0.38±0.09%. This is the first measurement of the multiplicity of neutrons associated with muon capture on oxygen without neutron energy threshold.

    DOI: 10.1103/pmyx-jn3s

    Open Access

    Scopus

    PubMed

  12. Sensitivity of the Hyper-Kamiokande experiment to neutrino oscillation parameters using accelerator neutrinos Open Access

    Abe, K; Afif, MT; Laamara, RA; Aihara, H; Ajmi, A; Akutsu, R; Alarakia-Charles, H; Alekseev, I; Hakim, YA; Monsalve, SA; Amato, E; Ameli, F; Anthony, L; Araya, A; Quiroga, AA; Arimoto, S; Asaoka, Y; Ashida, Y; Aushev, V; Merelo, FB; Barbi, M; Barr, G; Batkiewicz-Kwasniak, M; Beauchêne, A; Benchekroun, D; Berardi, V; Bernardini, E; Berns, L; Bhadra, S; Bhuiyan, N; Bian, J; Bianco, D; Blanchet, A; Blondel, A; Boistier, PMM; Bolognesi, S; Bonavera, L; Bonilla, JL; Bordoni, S; Bose, D; Boyd, S; Bozza, C; Bravar, A; Bronner, C; Bubak, A; Buchowicz, A; Avanzini, MB; Burton, G; Cafagna, FS; Calabria, NF; Mozota, JMC; Cao, S; Carabadjac, D; Cartwright, S; Casado, MP; Catanesi, MG; Cavanagh, C; Cebrián, S; Chakir, EM; Chakrabarty, S; Choi, JH; Choquet, A; Choubey, S; Martinez, EAC; Chytka, L; Cicerchia, M; Barrio, LC; Cieslar, M; Coleman, J; Collazuol, G; Cook, L; Cormier, F; Costas-Rodríguez, D; Craplet, A; Cuen-Rochin, S; Dalmazzone, C; Danilov, M; Daoud, M; Daret, T; De Cos, FJ; de la Fuente, E; De Lorenzis, A; De Rosa, G; Dealtry, T; Della Valle, M; Densham, C; Dergacheva, A; Devi, MM; Di Lodovico, F; Di Nitto, A; Di Nola, A; López, GD; Dieminger, TC; Divecha, D; Dobrzynska, M; Dohnal, T; Doyle, T; Drakopoulou, E; Drapier, O; Galvan, CD; Dumarchez, J; Dygnarowicz, K; Earle, S; Eguchi, A; El Abassi, A; El Baz, M; El Kaftaoui, A; Ellis, J; Elmansali, R; Emery, S; Er-Rabit, R; Ershova, A; Esmaili, A; Bosch, RE; Eurin, G; Anaya, CEF; Morales, LEF; Fannon, J; Fedotov, S; Feltre, M; Feng, J; Ferlewicz, D; Fernández-Menéndez, P; Fernández-Martinez, E; Ferrario, P; Ferrazzi, B; Finch, A; Finley, C; Aguirre, GAF; Fitton, M; Franks, M; Friend, M; Fujii, Y; Fukuda, Y; Fusco, L; Gaior, R; Galinski, G; Goñi, RG; Gao, J; Riesgo, FG; Garde, C; Gaur, R; Gialanella, L; Giganti, C; Gligorov, V; Gogota, O; Gola, M; Goldsack, A; Gomez-Cadenas, JJ; Gonin, M; González-Nuevo, J; Gorin, A; Gornea, R; Goto, S; Gouighri, M; Rodriguez, JG; Graham, K; Gramegna, F; Grassi, M; Griguer, H; Guigue, M; Hadley, D; Hambardzumyan, A; Harada, M; Harris, RJ; Hartz, M; Harvey-Fishenden, E; Hassani, S; Hastings, NC; Hayashida, S; Hayato, Y; Hayrapetyan, K; Heitkamp, I; Hernandez-Molinero, B; Morata, JAH; Bosch, VH; Hino, Y; Hiraide, K; Holeczek, J; Holin, A; Horiuchi, S; Hoshina, K; Hosokawa, K; Hoummada, A; Hruby, F; Hua, H; Hultqvist, K; Iacob, F; Ichikawa, AK; Ibnsalih, WI; Ieki, K; Ikeda, M; Inácio, AS; Ioannisian, A; Ishida, T; Ishidoshiro, K; Ishino, H; Ishitsuka, M; Israel, H; Ito, H; Itow, Y; Izmaylov, A; Izumiyama, S; Jamieson, B; Jang, J; Jenkins, S; Jesús-Valls, C; Jo, HS; Jones, TP; Jonsson, P; Joo, KK; Joshi, S; Kajita, T; Kakuno, H; Kalousis, L; Kameda, J; Kano, Y; Karlen, D; Kataoka, Y; Kato, A; Katori, T; Kazarian, N; Khabibullin, M; Khotjantsev, A; Kikawa, T; Kim, JY; King, S; Kisiel, J; Klimaszewski, J; Kneale, L; Kobayashi, M; Kobayashi, T; Kodama, S; Koerich, L; Kolev, N; Komaba, H; Konaka, A; Kormos, L; Kose, U; Koshio, Y; Kosinski, T; Kouzakov, K; Kowalik, K; Kralik, R; Kravchuk, L; Kryukov, A; Kudenko, Y; Kulkarni, A; Kumita, T; Kurjata, R; Kutter, T; Kuze, M; Kvita, J; Kwak, K; Kwon, E; Labarga, L; Lachner, K; Lagoda, J; Lamanna, G; James, ML; Langella, A; Laporte, J; Latham, N; Laveder, M; Lavitola, L; Lawe, M; Le Blévec, E; Lee, J; Leitner, R; Levorato, S; Lewis, S; Li, B; Li, Q; Li, X; Lim, I; Limbu, U; Lindner, T; Litchfield, RP; Liu, Y; Long, K; Longhin, A; López-Gejo, F; Moreno, AL; Lorens, P; Lu, P; Lu, X; Ludovici, L; Lux, T; Maekawa, Y; Magaletti, L; Mahesh, J; Maimí, P; Makida, Y; Malek, M; Malinsky, M; Mandal, M; Mandokoro, Y; Mansoor, M; Marchi, T; Mariani, C; Marinelli, A; Markou, C; Maroufkhani, F; Martens, K; Marti, L; Martin, J; Martinez, L; Martini, M; Marzec, J; Matsubara, T; Matsumoto, R; Matusiak, M; Mazurek, K; McCauley, N; Medhi, A; Mefodiev, A; Mehta, P; Melbourne, WJD; Mellet, L; Mendez-Esteban, D; Maco, JM; Menjo, H; Zavala, GDM; Mezzetto, M; Migenda, J; Migliozzi, P; Miki, S; Mikola, V; Miller, E; Minamino, A; Mine, S; Mineev, O; Miura, M; Moharana, R; Mollo, CM; Mondal, T; Monrabal, F; Moon, CS; Moon, DH; Mas, FJM; Morescalchi, L; Moriyama, S; Mueller, TA; Nakadaira, T; Nakagiri, K; Nakahata, M; Nakai, S; Nakajima, Y; Nakamura, K; Nakamura, KD; Nakano, Y; Nakaya, T; Nakayama, S; Machado, LN; Naseby, C; Ng, WH; Niewczas, K; Ninomiya, K; Nishimori, S; Nishimura, Y; Noguchi, Y; Nosek, T; Nova, F; Nozka, L; Nugent, JC; Nunokawa, H; Nurek, M; O'Connor, E; O'Flaherty, M; O'Keeffe, HM; O'Sullivan, E; Obrebski, W; Ochoa-Ricoux, P; Ogitsu, T; Okazaki, R; Okumura, K; Onda, N; Orozco-Luna, F; Ospina, N; Ostrowski, M; Otani, N; Oyama, Y; Pac, MY; Paganini, P; Palacio, J; Pari, M; Park, J; Pasternak, J; Pastore, C; Pastuszak, G; Pate, C; Pavin, M; Payne, D; Mosquera, JP; Peña-Garay, C; de Perio, P; Périssé, L; Pinzino, J; Piotrowski, B; Playfer, S; Pointon, B; Ponticelli, E; Popov, A; Popov, B; Posiadala-Zezula, M; Pronost, G; Prouse, NW; Quach, C; Quilain, B; Radicioni, E; Rajda, P; Cascón, ER; Ramsden, R; Renner, J; Rescigno, M; Ricciardi, G; Richards, B; Richards, K; Riley, DW; Rimmer, J; Cabo, SR; Rogly, R; Roig-Tormo, E; Romo-Fuentes, MF; Rondio, E; Roskovec, B; Roth, S; Rott, C; Rubbia, A; Ruggeri, AC; Russo, S; Rychter, A; Ryu, D; Saenz, W; Sakashita, K; Samani, S; Sánchez, F; Rodríguez, MLS; Sandford, E; Santos, A; Rodríguez, JDS; Sarker, A; Sarmah, P; Sato, K; Sato, Y; Schloesser, C; Scott, M; Seiya, Y; Sekiguchi, T; Sekiya, H; Seo, JW; Sgalaberna, D; Shimizu, I; Shimizu, K; Shin, CD; Shinoki, M; Shiozawa, M; Shvartsman, A; Simonelli, A; Skrobova, N; Skwarczynski, K; Smithers, BR; Smy, M; Sobczyk, J; Sobel, HW; Soler, FJP; Sozzi, MS; Spina, R; Spisso, B; Spradlin, P; Stankevich, K; Stavropoulos, D; Stawarz, L; Stowell, P; Studenikin, A; Gomez, SLS; Suchenek, M; Sunanda; Suwa, Y; Suzuki, A; Suzuki, SY; Suzuki, Y; Svirida, D; Tada, M; Taghayor, S; Takeda, A; Takemoto, Y; Taketa, A; Takeuchi, Y; Takhistov, V; Tanaka, H; Tanaka, HKM; Tanaka, M; Tanigawa, H; Tashiro, T; Terada, K; Thiesse, M; Thrane, E; Tiwari, D; Alarcón, JFT; Sánchez, AKT; Tomiya, T; Tran, N; Tseng, J; Tsuchii, R; Tsui, KM; Tsukamoto, T; Tsushima, T; Tzanov, M; Uchida, Y; Urano, S; Urquijo, P; Vagins, M; Valder, S; Vallmajó, O; Vasseur, G; Vinning, B; Virginet, U; Vivolo, D; Vladisavljevic, T; Vogelaar, R; Vyalkov, M; Wachala, T; Wark, D; Wendell, R; Wilson, JR; Wilson, S; Wojciechowski, M; Wronka, S; Wuethrich, J; Xia, J; Xie, Z; Yamaguchi, Y; Yamamoto, K; Yamashita, M; Yamauchi, K; Yang, BS; Yano, T; Yershov, N; Yevarouskaya, U; Yokoyama, M; Yoo, J; Yoshida, T; Yoshimoto, Y; Yoshioka, Y; Yousefnejad, S; Yu, I; Yu, T; Yuriy, O; Zaldivar, B; Zalipska, J; Zaremba, K; Zarnecki, G; Zhao, X; Zhong, H; Zhu, T; Ziembicki, M; Zietara, K; Zito, M; Zsoldos, S

    EUROPEAN PHYSICAL JOURNAL C   86 巻 ( 2 )   2026年2月

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    出版者・発行元:European Physical Journal C  

    This paper presents the expected sensitivity to the neutrino oscillation parameters of the Hyper-Kamiokande long-baseline program. The Hyper-Kamiokande experiment, currently under construction in Japan, will measure the oscillations of accelerator-produced neutrinos with thousands of selected events per sample: this corresponds to an increase of statistics of a factor 25–100 with respect to recent results from the currently-running long-baseline neutrino oscillation experiment in Japan, T2K. In the most favorable scenario we will achieve the discovery of Charge-Parity (CP) violation in neutrino oscillation at 5σ C.L. in less than 3 years. With 10 years of data-taking, and assuming a neutrino : antineutrino beam running ratio of 1:3, a CP violation discovery at 5σ C.L. is possible for more than 60% of the actual values of the CP-violating phase, δCP. Moreover, we will measure δCP with a precision ranging from 20∘, in the case of maximal CP violation, to 6∘, in the case of CP conservation. We aim to achieve a 0.5% resolution on the Δm322 parameter, and a resolution between 3% and 0.5% on the sin2θ23 parameter, depending on its true value. These results are obtained by extending the analysis methods of T2K with dedicated tuning to take into account the Hyper-Kamiokande design: the larger far detector, the more powerful beam, the upgraded near detector ND280, and the planned additional Intermediate Water Cherenkov Detector.

    DOI: 10.1140/epjc/s10052-025-14938-9

    Open Access

    Web of Science

    Scopus

  13. First Associated Neutrino Search for a Failed Supernova Candidate with Super-Kamiokande Open Access

    Nakanishi, F; Abe, K; Abe, S; Asaoka, Y; Harada, M; Hayato, Y; Hiraide, K; Hosokawa, K; Hung, TH; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakahata, M; Nakayama, S; Noguchi, Y; Pronost, G; Sato, K; Sekiya, H; Shiozawa, M; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Itow, Y; Kajita, T; Nishijima, R; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Fernandez, P; Labarga, L; Zaldivar, B; Pointon, BW; Yanagisawa, C; Kearns, E; Wan, L; Wester, T; Bian, J; Cortez, B; Griskevich, NJ; Jiang, Y; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Yang, BS; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Blévec, L; Drapier, O; Ershova, A; Ferey, M; Mueller, TA; Santos, AD; Paganini, P; Quach, C; Rogly, R; Nakamura, T; Jang, JS; Litchfield, RP; Machado, LN; Soler, FJP; Learned, JG; Choi, K; Cao, S; Anthony, LHV; Prouse, NW; Scott, M; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Ospina, N; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Feltre, M; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Quilain, B; Horiuchi, S; Kawabata, A; Kobayashi, M; Liu, YM; Maekawa, Y; Nishimura, Y; Akutsu, R; Friend, M; Hasegawa, T; Hino, Y; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Oyama, Y; Yrey, AP; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Katori, T; Kralik, R; Latham, N; Ramsden, RM; Ito, H; Sone, T; Suzuki, AT; Takeuchi, Y; Wada, S; Zhong, H; Feng, J; Feng, L; Han, S; Hikida, J; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Ngoc, TV; Nakaya, T; Wendell, RA; Jenkins, SJ; Mccauley, N; Tarrant, A; Fanì, M; Wilking, MJ; Xie, Z; Fukuda, Y; Menjo, H; Yoshioka, Y; Lagoda, J; Mandal, M; Zalipska, J; Mori, M; Jiang, J; Hamaguchi, K; Ishino, H; Koshio, Y; Tada, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; Mcelwee, JM; Peacock, T; Stowell, P; Thiesse, MD; Thompson, LF; Okazawa, H; Lakshmi, SM; Kwon, E; Lee, MW; Seo, JW; Yu, I; Ashida, Y; Ichikawa, AK; Nakamura, KD; Goto, S; Hayasaki, H; Kodama, S; Kong, Y; Masaki, Y; Mizuno, Y; Muro, T; Nakagiri, K; Nakajima, Y; Taniuchi, N; Yokoyama, M; De Perio, P; Fujita, S; Jesús-Valls, C; Martens, K; Marti, L; Tsui, KM; Vagins, MR; Xia, J; Kuze, M; Izumiyama, S; Matsumoto, R; Asaka, R; Ishitsuka, M; Sugo, M; Wako, M; Yamauchi, K; Nakano, Y; Cormier, F; Gaur, R; Hartz, M; Konaka, A; Li, X; Smithers, BR; Chen, S; Wu, Y; Xu, BD; Zhang, AQ; Zhang, B; Adhikary, H; Girgus, M; Govindaraj, P; Posiadala-Zezula, M; Prabhu, YS; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Bronner, C; Horiguchi, D; Minamino, A; Sasaki, Y; Shibayama, R; Shimamura, R

    ASTROPHYSICAL JOURNAL LETTERS   997 巻 ( 1 )   2026年1月

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    出版者・発行元:Astrophysical Journal Letters  

    In 2024, a failed supernova (SN) candidate, M31-2014-DS1, was reported in the Andromeda galaxy (M31), located at a distance of approximately 770 kpc. In this Letter, we search for neutrinos from this failed SN using data from Super-Kamiokande (SK). Based on the estimated time of black hole formation inferred from optical and infrared observations, we define a search window for neutrino events in the SK data. Using this window, we develop a dedicated analysis method for failed SNe and apply it to M31-2014-DS1, by conducting a cluster search using the timing and energy information of candidate events. No significant neutrino excess is observed within the search region. Consequently, we place an upper limit on the time-integrated electron antineutrino luminosity from M31-2014-DS1 and discuss its implications for various failed SN models and their neutrino emission characteristics. Despite the 18 MeV threshold adopted to suppress backgrounds, the search remains sufficiently sensitive to constrain the Shen-TM1 equation of state, in a more optimistic emission scenario with progenitor stars of 40 M<inf>⊙</inf> and relatively high mean electron-antineutrino energies of about 23.2 MeV, yielding a 90% confidence level upper limit of 1.76 × 10<sup>53</sup> erg on the time-integrated electron antineutrino luminosity, moderately above the expected value of 1.35 × 10<sup>53</sup> erg.

    DOI: 10.3847/2041-8213/ae2c73

    Open Access

    Web of Science

    Scopus

  14. Measurement of the top-quark Yukawa coupling from tt¯ production in the lepton+jets final state using pp collisions at s=13 TeV with the ATLAS detector Open Access

    Aad G., Aakvaag E., Abbott B., Abdelhameed S., Abeling K., Abicht N.J., Abidi S.H., Aboelela M., Aboulhorma A., Abramowicz H., Abulaiti Y., Acharya B.S., Ackermann A., Adam Bourdarios C., Adamczyk L., Addepalli S.V., Addison M.J., Adelman J., Adiguzel A., Adye T., Affolder A.A., Afik Y., Agaras M.N., Aggarwal A., Agheorghiesei C., Ahmadov F., Ahuja S., Ahuja S., Ai X., Aielli G., Aikot A., Ait Tamlihat M., Aitbenchikh B., Åkesson T.P.A., Akimov A.V., Akiyama D., Akolkar N.N., Aktas S., Alberghi G.L., Albert J., Alberti U., Albicocco P., Albouy G.L., Alderweireldt S., Alegria Z.L., Aleksa M., Aleksandrov I.N., Alexa C., Alexopoulos T., Alfonsi F., Algren M., Alhroob M., Ali B., Ali H.M.J., Ali S., Alibocus S.W., Aliev M., Alimonti G., Alkakhi W., Allaire C., Allbrooke B.M.M., Allen D.R., Allen J.S., Allen J.F., Allport P.P., Aloisio A., Alonso F., Alpigiani C., Alsolami Z.M.K., Alvarez Fernandez A., Alves Cardoso M., Alviggi M.G., Aly M., Amaral Coutinho Y., Ambler A., Amelung C., Amerl M., Ames C.G., Amezza T., Amidei D., Amini B., Amirie K., Amirkhanov A., Amor Dos Santos S.P., Amos K.R., Amperiadou D., An S., Anastopoulos C., Andeen T., Anders J.K., Anderson A.C., Andreazza A., Angelidakis S., Angerami A., Anisenkov A.V., Annovi A., Antel C., Antipov E., Antonelli M., Anulli F.

    Journal of High Energy Physics   2026 巻 ( 1 )   2026年1月

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    出版者・発行元:Journal of High Energy Physics  

    The top-quark Yukawa coupling is extracted from the distribution of the top-quark pair (tt¯) invariant mass in proton-proton collisions using 140 fb<sup>−1</sup> of data at s=13 TeV collected in 2015–2018 by the ATLAS experiment at the Large Hadron Collider. In the region near the production threshold, the tt¯ invariant mass spectrum is sensitive to electroweak virtual corrections, including contributions from Higgs boson exchange, thereby providing sensitivity to the top-quark Yukawa coupling. This is the first measurement in ATLAS that aims to obtain this coupling exploiting this approach. The tt¯ system is reconstructed in the single-lepton final state, requiring exactly one isolated electron or muon and at least four jets with at least two identified as originating from b-quarks. The measured Yukawa coupling is found to be in good agreement with the Standard Model prediction. An upper limit on the top-quark Yukawa coupling strength of Y<inf>t</inf>< 2.1 relative to the Standard Model prediction is observed at 95% confidence level, consistent with the expected sensitivity.

    DOI: 10.1007/JHEP01(2026)117

    Open Access

    Scopus

  15. Search for nucleon decay via p → νπ+ and n → νπ0 in 0.484 Mton-year of Super-Kamiokande data Open Access

    Jung S., Abe K., Asaoka Y., Harada M., Hayato Y., Hiraide K., Hung T.H., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakagiri K., Nakahata M., Nakayama S., Noguchi Y., Pronost G., Sato K., Sekiya H., Shinoda R., Shiozawa M., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Chen S., Itow Y., Kajita T., Nishijima R., Okumura K., Tashiro T., Tomiya T., Wang X., Fernandez P., Labarga L., Samudio D., Zaldivar B., Yanagisawa C., Jargowsky B., Kearns E., Mirabito J., Wan L., Wester T., Pointon B.W., Bian J., Cortez B., Griskevich N.J., Jiang Y., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Moon D.H., Park R.G., Yang B.S., Scholberg K., Walter C.W., Drapier O., Ershova A., Ferey M., Le Blévec E., Mueller T.A., Paganini P., Quach C., Rogly R., Nakamura T., Jang J.S., Litchfield R.P., Machado L.N., Soler F.J.P., Learned J.G., Choi K., Cao S., Anthony L.H.V., Prouse N.W., Scott M., Uchida Y., Berardi V., Calabria N.F., Catanesi M.G., Ospina N., Radicioni E., Langella A., De Rosa G., Collazuol G., Feltre M., Mattiazzi M., Ludovici L., Gonin M., Périssé L., Quilain B., Horiuchi S., Kawabata A., Kobayashi M.

    Physical Review D   113 巻 ( 1 )   2026年

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    出版者・発行元:Physical Review D  

    We present the results of searches for nucleon decays via p → νπ<sup>þ</sup> and n → νπ<sup>0</sup> using a 0.484 Mt · yr exposure of Super-Kamiokande I-V data covering the entire pure water phase of the experiment. Various improvements on the previous 2014 nucleon decay search [Phys. Rev. Lett. 113, 121802 (2014)], which used an exposure of 0.173 Mt · yr, are incorporated. The physics models related to pion production and nuclear interaction are refined with external data, and a more comprehensive set of systematic uncertainties, now including those associated with the atmospheric neutrino flux and pion production channels, is considered. Also, the fiducial volume has been expanded by 21%. No significant indication of a nucleon decay signal is found beyond the expected background. Lower bounds on the nucleon partial lifetimes are determined to be 3.5 × 10<sup>32</sup> yr for p → νπ<sup>þ</sup> and 1.4 × 10<sup>33</sup> yr for n → νπ<sup>0</sup> at 90% confidence level.

    DOI: 10.1103/gwc6-55bg

    Open Access

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  16. Search for neutron decay into an antineutrino and a neutral kaon in 0.401 megaton-years exposure of Super-Kamiokande Open Access

    Yamauchi, K; Abe, K; Abe, S; Asaoka, Y; Harada, M; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakahata, M; Nakayama, S; Noguchi, Y; Pronost, G; Sato, K; Sekiya, H; Shimizu, K; Shinoda, R; Shiozawa, M; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Itow, Y; Kajita, T; Nishijima, R; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Fernandez, P; Labarga, L; Samudio, D; Zaldivar, B; Pointon, BW; Yanagisawa, C; Kearns, E; Mirabito, J; Wan, L; Wester, T; Bian, J; Cortez, B; Griskevich, NJ; Jiang, Y; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Yang, BS; Bodur, B; Scholberg, K; Walter, CW; Beauchene, A; Drapier, O; Ershova, A; Mueller, TA; Santos, AD; Paganini, P; Quach, C; Rogly, R; Nakamura, T; Jang, JS; Litchfield, RP; Machado, LN; Soler, FJP; Learned, JG; Choi, K; Iovine, N; Tiwari, D; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Ospina, N; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Feltre, M; Mattiazzi, M; Ludovici, L; Gonin, M; Periss, L; Quilain, B; Horiuchi, S; Kawabata, A; Kobayashi, M; Liu, YM; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Hino, Y; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Yrey, AP; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Katori, T; Kralik, R; Migenda, J; Ramsden, RM; Zsoldos, S; Ito, H; Sone, T; Suzuki, AT; Takagi, Y; Takeuchi, Y; Wada, S; Zhong, H; Feng, J; Feng, L; Han, S; Hikida, J; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Nakaya, T; Ngoc, TV; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Tarrant, A; Fani, M; Wilking, MJ; Xie, Z; Fukuda, Y; Menjo, H; Yoshioka, Y; Lagoda, J; Mandal, M; Zalipska, J; Mori, M; Jia, M; Jiang, J; Shi, W; Hamaguchi, K; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Peacock, T; Stowell, P; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Kwon, E; Lee, MW; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Eguchi, A; Goto, S; Kodama, S; Mizuno, Y; Muro, T; Nakagiri, K; Nakajima, Y; Taniuchi, N; Watanabe, E; Yokoyama, M; De Perio, P; Fujita, S; Jesus-Valls, C; Martens, K; Marti, L; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Terada, K; Asaka, R; Ishitsuka, M; Shinoki, M; Sugo, M; Wako, M; Yoshida, T; Nakano, Y; Cormier, F; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Smithers, BR; Chen, S; Wu, Y; Xu, BD; Zhang, AQ; Zhang, B; Girgus, M; Govindaraj, P; Posiadala-Zezula, M; Prabhu, YS; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Bronner, C; Horiguchi, D; Minamino, A; Sasaki, Y; Shibayama, R; Shimamura, R

    PHYSICAL REVIEW D   112 巻 ( 9 ) 頁: 1 - 13   2025年11月

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    出版者・発行元:Physical Review D  

    We searched for bound neutron decay via n → ν̄ + K<sup>0</sup> predicted by the grand unified theories in 0.401 Mton · years exposure of all pure water phases in the Super-Kamiokande detector. About 4.4 times more data than in the previous search have been analyzed by a new method including a spectrum fit to kaon invariant mass distributions. No significant data excess has been observed in the signal regions. As a result of this analysis, we set a lower limit of 7.8 × 10<sup>32</sup> years on the neutron lifetime at a 90% confidence level.

    DOI: 10.1103/thqt-8fp1

    Open Access

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  17. Measurement of neutron production in atmospheric neutrino interactions at Super-Kamiokande Open Access

    Han S., Abe K., Abe S., Asaoka Y., Bronner C., Harada M., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakahata M., Nakayama S., Noguchi Y., Pronost G., Sato K., Okamoto K., Sekiya H., Shiba H., Shimizu K., Shinoda R., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Takenaka A., Tanaka H., Yano T., Kajita T., Okumura K., Nishijima R., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Samudio D., Zaldivar B., Pointon B.W., Yanagisawa C., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Cortez B., Griskevich N.J., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Jang M.C., Lee S.H., Moon D.H., Park R.G., Yang B.S., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Ershova A., Mueller T.A., Santos A.D., Paganini P., Quach C., Rogly R., Nakamura T., Jang J.S., Machado L.N., Soler F.P., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Uchida Y., Sztuc A.A., Berardi V., Calabria N.F., Catanesi M.G., Radicioni E., Langella A.

    Physical Review D   112 巻 ( 1 ) 頁: 1 - 24   2025年7月

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    出版者・発行元:Physical Review D  

    We present measurements of total neutron production from atmospheric neutrino interactions in water, analyzed as a function of electron-equivalent visible energy over a range of 30 MeV to 10 GeV. These results are based on 4,270 days of data collected by Super-Kamiokande, including 564 days with 0.011 wt% gadolinium added to enhance neutron detection. Neutron signal selection is based on a neural network trained on simulation, with its performance validated using an Am/Be neutron point source. The measurements are compared to predictions from neutrino event generators combined with various hadron-nucleus interaction models, which include an intranuclear cascade model and a nuclear deexcitation model. We observe significant variations in the predictions depending on the choice of hadron-nucleus interaction model. We discuss key factors that contribute to describing our data, such as in-medium effects in the intranuclear cascade and the accuracy of statistical evaporation modeling.

    DOI: 10.1103/4d71-d69k

    Open Access

    Scopus

  18. First Joint Oscillation Analysis of Super-Kamiokande Atmospheric and T2K Accelerator Neutrino Data Open Access

    Abe, K; Abe, S; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakahata, M; Nakano, Y; Nakayama, S; Noguchi, Y; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Tanaka, H; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Mirabito, J; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Smy, MB; Sobel, HW; Takhistov, V; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Rogly, R; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LHV; Martin, D; Prouse, NW; Scott, M; Uchida, Y; Berardi, V; Calabria, NF; Catanesi, MG; Radicioni, E; Langella, A; De Rosa, G; Collazuol, G; Feltre, M; Iacob, F; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Pronost, G; Fujisawa, C; Horiuchi, S; Kobayashi, M; Liu, YM; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Yrey, AP; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Suzuki, AT; Takagi, Y; Takeuchi, Y; Zhong, H; Feng, J; Feng, L; Hu, JR; Hu, Z; Kawaue, M; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarrant, A; Wilking, MJ; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Shi, W; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Ishizuka, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Jesús-Valls, C; Martens, K; Tsui, KM; Vagins, MR; Xia, J; Izumiyama, S; Kuze, M; Matsumoto, R; Terada, K; Asaka, R; Ishitsuka, M; Ito, H; Ommura, Y; Shigeta, N; Shinoki, M; Yamauchi, K; Yoshida, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Wu, Y; Zhang, AQ; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Shibayama, R; Shimamura, R; Suzuki, S; Akhlaq, N; Akutsu, R; Alarakia-Charles, H; Ali, A; Hakim, YIA; Monsalve, SA; Andreopoulos, C; Anthony, L; Antonova, M; Aoki, S; Apte, KA; Arai, T; Arihara, T; Arimoto, S; Asada, Y; Ashida, Y; Atkin, ET; Babu, N; Barbi, M; Barker, GJ; Barr, G; Barrow, D; Bates, P; Batkiewicz-Kwasniak, M; Berardi, V; Berns, L; Bhadra, S; Blanchet, A; Blondel, A; Bolognesi, S; Bordoni, S; Boyd, SB; Bravar, A; Bronner, C; Bubak, A; Avanzini, MB; Caballero, JA; Calabria, NF; Cao, S; Carabadjac, D; Carter, AJ; Cartwright, SL; Casado, MP; Cervera, A; Chakrani, J; Chalumeau, A; Cherdack, D; Chong, PS; Chvirova, A; Cicerchia, M; Coleman, J; Collazuol, G; Cook, L; Cormier, F; Cudd, A; D'ago, D; Dalmazzone, C; Daret, T; Dasgupta, P; Davis, C; Davydov, YI; De Roeck, A; De Rosa, G; Dealtry, T; Delogu, CC; Densham, C; Dergacheva, A; Dharmapal, R; Di Lodovico, F; Lopez, GD; Dolan, S; Douqa, D; Doyle, TA; Drapier, O; Duffy, KE; Dumarchez, J; Dunne, P; Dygnarowicz, K; Elias, J; Emery-Schrenk, S; Erofeev, G; Ershova, A; Eurin, G; Fedorova, D; Fedotov, S; Feltre, M; Feng, L; Ferlewicz, D; Finch, AJ; Aguirre, GAF; Fiorillo, G; Fitton, MD; Patiño, JMF; Fujii, Y; Fukuda, Y; Furui, Y; Giannessi, L; Giganti, C; Glagolev, V; Gonin, M; Rosa, JG; Goodman, EAG; Gorin, A; Gorshanov, K; Grassi, M; Guigue, M; Hadley, DR; Haigh, JT; Han, S; Harris, DA; Hassani, S; Hastings, NC; Hayato, Y; Heitkamp, I; Henaff, D; Hino, Y; Hogan, M; Holeczek, J; Holin, A; Holvey, T; Van, NTH; Honjo, T; Hosokawa, K; Hu, J; Ichikawa, AK; Ieki, K; Ikeda, M; Ishitsuka, M; Izmaylov, A; Jakkapu, M; Jamieson, B; Jenkins, SJ; Jia, M; Jiang, JJ; Ji, JY; Jonsson, P; Joshi, S; Jung, CK; Kabirnezhad, M; Kaboth, AC; Kajita, T; Kakuno, H; Kameda, J; Karpova, S; Kasetti, SP; Kasturi, VS; Kataoka, Y; Katori, T; Kawamura, Y; Kawaue, M; Kearns, E; Khabibullin, M; Khotjantsev, A; Kikawa, T; King, S; Kiseeva, V; Kisiel, J; Kneale, L; Kobayashi, H; Kobayashi, T; Koch, L; Kodama, S; Kolupanova, M; Konaka, A; Kormos, LL; Koto, T; Kowalik, K; Kudenko, Y; Kudo, Y; Kuribayashi, S; Kurjata, R; Kurochka, V; Kutter, T; Kuze, M; La Commara, M; Labarga, L; Lachat, M; Lachner, K; Lagoda, J; Lakshmi, SM; James, ML; Langella, A; Laporte, JF; Last, D; Latham, N; Laveder, M; Lavitola, L; Lawe, M; Lee, Y; Silverio, DL; Levorato, S; Lewis, S; Lin, C; Litchfield, RP; Liu, SL; Li, W; Longhin, A; Long, KR; Moreno, AL; Ludovici, L; Lu, X; Lux, T; Machado, LN; Magaletti, L; Mahn, K; Mahtani, KK; Mandal, M; Manly, S; Marino, AD; Marti-Magro, L; Martin, DGR; Martini, M; Martin, JF; Maruyama, T; Matsubara, T; Matsumoto, R; Matveev, V; Mauger, C; Mavrokoridis, K; Mazzucato, E; McCauley, N; McFarland, KS; McGrew, C; McKean, J; Mefodiev, A; Megias, GD; Mehta, P; Mellet, L; Metelko, C; Mezzetto, M; Miki, S; Miller, E; Minamino, A; Mineev, O; Miura, M; Bueno, LM; Moriyama, S; Moriyama, S; Morrison, P; Mueller, TA; Munford, D; Muñoz, A; Munteanu, L; Nagai, K; Nagai, Y; Nakagiri, K; Nakahata, M; Nakamura, A; Nakamura, KD; Nakano, Y; Nakayama, S; Nakaya, T; Nakayoshi, K; Naseby, CER; Ngoc, TV; Nguyen, DT; Nguyen, VQ; Niewczas, K; Nishimori, S; Nishimura, Y; Noguchi, Y; Nosek, T; Nova, F; Novella, P; Nugent, JC; O'Keeffe, HM; O'Sullivan, L; Odagawa, T; Okazaki, R; Okinaga, W; Okumura, K; Okusawa, T; Onda, N; Ospina, N; Osu, L; Palladino, V; Paolone, V; Pari, M; Parlone, J; Pasternak, J; Payne, D; Penn, GC; Pershey, D; Pfaff, M; Pickering, L; Pintaudi, G; Pistillo, C; Popov, B; Porwit, K; Posiadala-Zezula, M; Prabhu, YS; Prasad, H; Pupilli, F; Quilain, B; Quyen, PT; Radermacher, T; Radicioni, E; Radics, B; Ramirez, MA; Ratoff, PN; Reh, M; Riccio, C; Rondio, E; Roth, S; Roy, N; Rubbia, A; Russo, L; Rychter, A; Saenz, W; Sánchez, F; Sato, Y; Schefke, T; Schloesser, CM; Scholberg, K; Scott, M; Seiya, Y; Sekiya, H; Sgalaberna, D; Shaikhiev, A; Shiozawa, M; Shiraishi, Y; Shvartsman, A; Skrobova, N; Skwarczynski, K; Smyczek, D; Smy, M; Sobczyk, JT; Sobel, H; Soler, FJP; Speers, AJ; Spina, R; Stroke, Y; Suslov, IA; Suvorov, S; Suzuki, A; Suzuki, SY; Suzuki, Y; Tada, M; Tairafune, S; Takeda, A; Takeuchi, Y; Takifuji, K; Tanaka, HK; Tanigawa, H; Teklu, A; Tereshchenko, VV; Thamm, N; Thompson, LF; Toki, W; Touramanis, C; Tsukamoto, T; Tzanov, M; Uchida, Y; Vagins, M; Vargas, D; Varghese, M; Vasseur, G; Villa, E; Vinning, WGS; Virginet, U; Vladisavljevic, T; Wachala, T; Wakabayashi, D; Wallace, HT; Walsh, JG; Wang, Y; Wan, L; Wark, D; Wascko, MO; Weber, A; Wendell, R; Wilking, MJ; Wilkinson, C; Wilson, JR; Wood, K; Wret, C; Xia, J; Xu, YH; Yamamoto, K; Yamamoto, T; Yanagisawa, C; Yang, G; Yano, T; Yasutome, K; Yershov, N; Yevarouskaya, U; Yoshimoto, Y; Yoshimura, N; Yu, M; Zaki, R; Zalewska, A; Zalipska, J; Zaremba, K; Zarnecki, G; Zhang, J; Zhao, XY; Zhong, H; Zhu, T; Ziembicki, M; Zimmerman, ED; Zito, M

    PHYSICAL REVIEW LETTERS   134 巻 ( 1 ) 頁: 011801   2025年1月

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    記述言語:英語   出版者・発行元:Physical Review Letters  

    The Super-Kamiokande and T2K Collaborations present a joint measurement of neutrino oscillation parameters from their atmospheric and beam neutrino data. It uses a common interaction model for events overlapping in neutrino energy and correlated detector systematic uncertainties between the two datasets, which are found to be compatible. Using 3244.4 days of atmospheric data and a beam exposure of 19.7(16.3)×1020 protons on target in (anti)neutrino mode, the analysis finds a 1.9σ exclusion of CP conservation (defined as JCP=0) and a 1.2σ exclusion of the inverted mass ordering.

    DOI: 10.1103/PhysRevLett.134.011801

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    PubMed

  19. Measurement of the branching ratio of 16N, 15C, 12B, and 13B isotopes through the nuclear union capture reaction in the Super-Kamiokande detector Open Access

    Maekawa Y., Abe K., Abe S., Asaoka Y., Harada M., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakahata M., Nakayama S., Noguchi Y., Pronost G., Sato K., Sekiya H., Shimizu K., Shinoda R., Shiozawa M., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Itow Y., Kajita T., Nishijima R., Okumura K., Tashiro T., Tomiya T., Wang X., Fernandez P., Labarga L., Samudio D., Zaldivar B., Yanagisawa C., Kearns E., Mirabito J., Wan L., Wester T., Pointon B.W., Bian J., Cortez B., Griskevich N.J., Jiang Y., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Jang M.C., Lee S.H., Moon D.H., Park R.G., Yang B.S., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Ershova A., Mueller T.A., Santos A.D., Paganini P., Quach C., Rogly R., Nakamura T., Jang J.S., Litchfield R.P., Machado L.N., Soler F.J.P., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Uchida Y., Berardi V., Calabria N.F., Catanesi M.G., Ospina N., Radicioni E., Langella A., DeRosa G., Collazuol G., Feltre M., Mattiazzi M., Ludovici L., Gonin M., Périssé L.

    Physical Review C   112 巻 ( 6 )   2025年

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    出版者・発行元:Physical Review C  

    The Super-Kamiokande detector has measured solar neutrinos for more than 25 years. The sensitivity for solar neutrino measurement is limited by the uncertainties of energy scale and background modeling. Decays of unstable isotopes with relatively long half-lives through nuclear muon capture, such as <sup>16</sup>N, <sup>15</sup>C, <sup>12</sup>B, and <sup>13</sup>B, are detected as background events for solar neutrino observations. In this study, we developed a method to form a pair of stopping muon and decay candidate events and evaluated the production rates of such unstable isotopes. We then measured their branching ratios considering both their production rates and the estimated number of nuclear muon capture processes as Br(<sup>16</sup>N) = (9.0 ± 0.1)%,Br(<sup>15</sup>C) = (0.6 ± 0.1)%, Br(<sup>12</sup>B) = (0.98 ±0.18)%, Br(<sup>13</sup>B) = (0.14 ± 0.12)%, respectively. The result for <sup>16</sup>N has world-leading precision at present and the results for <sup>15</sup>C, <sup>12</sup>B, and <sup>13</sup>B are the first branching ratio measurements for those isotopes.

    DOI: 10.1103/b93l-dbpj

    Scopus

  20. Search for proton decay via p →e+η and p →μ+η with a 0.37 Mton-year exposure of Super-Kamiokande Open Access

    Taniuchi N., Abe K., Abe S., Asaoka Y., Bronner C., Harada M., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakahata M., Nakayama S., Noguchi Y., Pronost G., Okamoto K., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Takenaka A., Tanaka H., Watanabe S., Yano T., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Megias G.D., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Mirabito J., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Kropp W.R., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Jang M.C., Kim J.Y., Lee S.H., Lim I.T., Moon D.H., Park R.G., Yang B.S., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Bernard L., Coffani A., Drapier O., El Hedri S., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Rogly R., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Calabria N.F., Catanesi M.G.

    Physical Review D   110 巻 ( 11 )   2024年12月

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    出版者・発行元:Physical Review D  

    A search for proton decay into e+/μ+ and a η meson has been performed using data from a 0.373 Mton·year exposure (6050.3 live days) of Super-Kamiokande. Compared to previous searches this work introduces an improved model of the intranuclear η interaction cross section, resulting in a factor of 2 reduction in uncertainties from this source and ∼10% increase in signal efficiency. No significant data excess was found above the expected number of atmospheric neutrino background events resulting in no indication of proton decay into either mode. Lower limits on the proton partial lifetime of 1.4×1034 years for p→e+η and 7.3×1033 years for p→μ+η at the 90% CL were set. These limits are around 1.5 times longer than our previous study and are the most stringent to date.

    DOI: 10.1103/PhysRevD.110.112011

    Open Access

    Scopus

  21. Development of a Data Overflow Protection System for Super-Kamiokande to Maximize Data from Nearby Supernovae Open Access

    Mori, M; Abe, K; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Miki, S; Mine, S; Miura, M; Moriyama, S; Nakano, Y; Nakahata, M; Nakayama, S; Noguchi, Y; Okamoto, K; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, X; Yoshida, S; Megias, GD; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Kearns, E; Raaf, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Locke, S; Smy, MB; Sobel, HW; Takhistov, ; Yankelevich, A; Hill, J; Jang, MC; Lee, SH; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Drapier, O; Giampaolo, A; Mueller, TA; Santos, AD; Paganini, P; Quilain, B; Rogly, R; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Choi, K; Iovine, N; Cao, S; Anthony, LH; Martin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, ; Catanesi, MG; Radicioni, E; Calabria, NF; Langella, A; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Perisse, L; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Akutsu, R; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Bhuiyan, N; Burton, GT; Edwards, R; Di Lodovico, F; Gao, J; Goldsack, A; Katori, T; Migenda, J; Ramsden, RM; Xie, Z; Zsoldos, S; Kotsar, Y; Ozaki, H; Suzuki, AT; Takagi, Y; Takeuchi, Y; Zhong, H; Bronner, C; Feng, J; Hu, JR; Hu, Z; Kawaune, M; Kikawa, T; LiCheng, F; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Tarant, A; Fukuda, Y; Itow, Y; Menjo, H; Ninomiya, K; Yoshioka, Y; Lagoda, J; Lakshmi, SM; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jia, M; Jiang, J; Jung, CK; Shi, W; Wilking, MJ; Yanagisawa, C; Harada, M; Hino, Y; Ishino, H; Kitagawa, H; Koshio, Y; Nakanishi, F; Sakai, S; Tada, T; Tano, T; Barr, G; Barrow, D; Cook, L; Samani, S; Wark, D; Holin, A; Nova, F; Jung, S; Yang, BS; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Thiesse, MD; Thompson, LF; Wilson, S; Okazawa, H; Kim, SB; Kwon, E; Seo, JW; Yu, ; Ichikawa, AK; Nakamura, KD; Tairafune, S; Nishijima, K; Eguchi, A; Nakagiri, K; Nakajima, Y; Shima, S; Taniuchi, N; Watanabe, E; Yokoyama, M; de Perio, P; Fujita, S; Martens, K; Tsui, KM; Vagins, MR; Valls, CJ; Xia, J; Kuze, M; Izumiyama, S; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ommura, Y; Shigeta, N; Shinoki, M; Suganuma, T; Yamauchi, K; Yoshida, T; Martin, JF; Tanaka, HA; Towstego, T; Gaur, R; Gousy-Leblanc, ; Hartz, M; Konaka, A; Li, X; Prouse, NW; Chen, S; Xu, BD; Zhang, B; Posiadala-Zezula, M; Boyd, SB; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Amanai, S; Marti, L; Minamino, A; Pintaudi, G; Sano, S; Suzuki, S; Wada, K

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   2024 巻 ( 10 )   2024年10月

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    出版者・発行元:Progress of Theoretical and Experimental Physics  

    Neutrinos from very nearby supernovae, such as Betelgeuse, are expected to generate more than ten million events over 10 s in Super-Kamokande (SK). At such large event rates, the buffers of the SK analog-to-digital conversion board (QBEE) will overflow, causing random loss of data that are critical for understanding the dynamics of the supernova explosion mechanism. In order to solve this problem, two new data-acquisition (DAQ) modules were developed to aid in the observation of very nearby supernovae. The first of these, the SN module, is designed to save only the number of hit photomultiplier tubes during a supernova burst and the second, the Veto module, prescales the high-rate neutrino events to prevent the QBEE from overflowing based on information from the SN module. In the event of a very nearby supernova, these modules allow SK to reconstruct the time evolution of the neutrino event rate from beginning to end using both QBEE and SN module data. This paper presents the development and testing of these modules together with an analysis of supernova-like data generated with a flashing laser diode. We demonstrate that the Veto module successfully prevents DAQ overflows for Betelgeuse-like supernovae as well as the long-term stability of the new modules. During normal running the Veto module is found to issue DAQ vetos a few times per month resulting in a total dead-time less than 1 ms, and does not influence ordinary operations. Additionally, using simulation data we find that supernovae closer than 800 pc will trigger the Veto module, resulting in a prescaling of the observed neutrino data.

    DOI: 10.1093/ptep/ptae128

    Open Access

    Web of Science

    Scopus

  22. Measurements of the charge ratio and polarization of cosmic-ray muons with the Super-Kamiokande detector Open Access

    Kitagawa H., Tada T., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakahata M., Nakano Y., Nakayama S., Noguchi Y., Okamoto K., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Takenaka A., Tanaka H., Watanabe S., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Megias G.D., Fernandez P., Labarga L., Ospina N., Zaldivar B., Kearns E., Raaf J.L., Wan L., Wester T., Pointon B.W., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Jang M.C., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Paganini P., Quilain B., Rogly R., Santos A.D., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Marin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Calabria N.F., Catanesi M.G., Radicioni E., Langella A., De Rosa G., Collazuol G., Iacob F., Lamoureux M., Mattiazzi M., Ludovici L.

    Physical Review D   110 巻 ( 8 )   2024年10月

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    出版者・発行元:Physical Review D  

    We present the results of the charge ratio (R) and polarization (P0μ) measurements using decay electron events collected between September 2008 and June 2022 with the Super-Kamiokande detector. Because of its underground location and long operation, we are able to perform high-precision measurements by accumulating cosmic-ray muons. We measured the muon charge ratio to be R=1.32±0.02(stat+syst) at EμcosθZenith=0.7-0.2+0.3 TeV, where Eμ is the muon energy and θZenith is the zenith angle of incoming cosmic-ray muons. This result is consistent with the Honda flux model while indicating a tension with the πK model of 1.9σ. We also measured the muon polarization at the production location to be P0μ=0.52±0.02 (stat+syst) at the muon momentum of 0.9-0.1+0.6 TeV/c at the surface of the mountain; this also suggests a tension with the Honda flux model of 1.5σ. This is the most precise measurement ever to experimentally determine the cosmic-ray muon polarization near 1 TeV/c. These measurement results are useful to improve atmospheric neutrino simulations.

    DOI: 10.1103/PhysRevD.110.082008

    Open Access

    Scopus

  23. Combined Pre-supernova Alert System with KamLAND and Super-Kamiokande Open Access

    Abe S., Eizuka M., Futagi S., Gando A., Gando Y., Goto S., Hachiya T., Hata K., Ichimura K., Ieki S., Ikeda H., Inoue K., Ishidoshiro K., Kamei Y., Kawada N., Kishimoto Y., Koga M., Kurasawa M., Mitsui T., Miyake H., Morita D., Nakahata T., Nakajima R., Nakamura K., Nakamura R., Nakane J., Ozaki H., Saito K., Sakai T., Shimizu I., Shirai J., Shiraishi K., Shoji R., Suzuki A., Takeuchi A., Tamae K., Watanabe H., Watanabe K., Yoshida S., Umehara S., Fushimi K., Kotera K., Urano Y., Berger B.E., Fujikawa B.K., Learned J.G., Maricic J., Fu Z., Smolsky J., Winslow L.A., Efremenko Y., Karwowski H.J., Markoff D.M., Tornow W., Dell’Oro S., O’Donnell T., Detwiler J.A., Enomoto S., Decowski M.P., Weerman K.M., Grant C., Song H., Li A., Axani S.N., Garcia M., Suzuki S., Abe K., Abe S., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakahata M., Nakano Y., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S.

    Astrophysical Journal   973 巻 ( 2 )   2024年10月

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    出版者・発行元:Astrophysical Journal  

    Preceding a core-collapse supernova (CCSN), various processes produce an increasing amount of neutrinos of all flavors characterized by mounting energies from the interior of massive stars. Among them, the electron antineutrinos are potentially detectable by terrestrial neutrino experiments such as KamLAND and Super-Kamiokande (SK) via inverse beta decay interactions. Once these pre-supernova (pre-SN) neutrinos are observed, an early warning of the upcoming CCSN can be provided. In light of this, KamLAND and SK, both located in the Kamioka mine in Japan, have been monitoring pre-SN neutrinos since 2015 and 2021, respectively. Recently, we performed a joint study between KamLAND and SK on pre-SN neutrino detection. A pre-SN alert system combining the KamLAND detector and the SK detector was developed and put into operation, which can provide a supernova alert to the astrophysics community. Fully leveraging the complementary properties of these two detectors, the combined alert is expected to resolve a pre-SN neutrino signal from a 15 M <inf>⊙</inf> star within 510 pc of the Earth at a significance level corresponding to a false alarm rate of no more than 1 per century. For a Betelgeuse-like model with optimistic parameters, it can provide early warnings up to 12 hr in advance.

    DOI: 10.3847/1538-4357/ad5fee

    Open Access

    Scopus

  24. Evaluation of neutron tagging efficiency on 0.03% Gd mass concentration in SK-Gd experiment

    Nakanishi F., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

    Proceedings of Science   444 巻   2024年9月

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    出版者・発行元:Proceedings of Science  

    Super-Kamiokande (SK) experiment started the "SK-Gd experiment" by dissolving gadolinium (Gd) sulfate octa-hydrate in ultra-pure water from the tank in July 2020. The neutron tagging efficiency has been improved compared to the pure-water phase by detecting a total energy of 8 MeV gamma rays emitted by thermal neutron capture on Gd. It enables us to improve, for example, the sensitivity of diffuse supernova neutrino background, the accuracy of the reconstruction for the supernova direction, and so on. For these physics targets, accurate evaluation of neutron identification efficiency is essential. In this presentation, I report the calibration results using an Am/Be neutron source to evaluate the efficiency at a Gd mass concentration of 0.03%, starting from June 2022, and the comparison of the estimated neutron detection efficiency with simulation.

    Scopus

  25. Time-dependent and Time-independent Directional Search for High-Energy Astrophysical Neutrino Point Sources in Super-Kamiokande

    Wang X., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

    Proceedings of Science   444 巻   2024年9月

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    出版者・発行元:Proceedings of Science  

    This contribution reports the results of the searches for high-energy astrophysical neutrino point sources in the energy range above GeV using Super-Kamiokande data. The searches include time-integrated and time-dependent full sky searches for both ν<inf>μ</inf> and ν<inf>e</inf> sources and coincidence check with candidates including TXS 0506+056 and NGC 1068. The searches use unbinned maximum likelihood method, and test statistics is calculated to find signal excess over atmospheric neutrino background. The time-integrated search method is updated from a previous search by adding the neutrino energy distribution in the likelihood to consider different power-law emission spectra with varying spectral indices. This is the first time to perform the time-dependent search, which has a better performance in searching for neutrino emission in a short time period, in Super-Kamiokande. Upper limits on neutrino flux or fluence are set for all searches.

    Scopus

  26. Study of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos in the SK-Gd experiment

    Sakai S., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

    Proceedings of Science   444 巻   2024年9月

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    出版者・発行元:Proceedings of Science  

    The atmospheric neutrino-oxygen neutral-current quasielasatic (NCQE) reactions are one of the main background in the search for supernova relic neutrinos. Here, we report the first measurement of the atmospheric neutrino-oxygen NCQE cross section in the Super-Kamiokande Gadolinium (SK-Gd) experiment using 552.2 days of full SK-VI data. The measured NCQE cross section is 0.74 ± 0.22(stat.) <sup>+</sup><inf>−</inf><sup>0.86</sup><inf>0.16</inf>(syst.) × 10<sup>−38</sup> cm<sup>2</sup>, which is consistent with the theoretical NCQE cross section and the previous study in SK within the range of the uncertainty. Furthermore, we established the verification method for nucleon-nucleus interaction models using atmospheric neutrino events. We performed the verification using the Bertini Cascade model (BERT), the Binary Cascade model (BIC) and the Liège Intranuclear Cascade model (INCL++). As a result, we suggested that BIC and INCL++ are closer to the observed data.

    Scopus

  27. Status and Prospect of SK-Gd Project

    Hino Y., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

    Proceedings of Science   444 巻   2024年9月

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    出版者・発行元:Proceedings of Science  

    In 2020, a new phase of Super-Kamiokande experiment, SK-Gd, was started by loading gadolinium into the pure water. This led to a high neutron detection efficiency, which allows us to distinguish different neutrino reactions, enhance signals and remove backgrounds more efficiently. In the summer of 2022, an update of SK-Gd was done by adding additional Gd, and thus totally 39 tonnes of gadolinium sulfate octahydrate has been introduced in the water. The Gd concentration was estimated as 0.0332±0.0002% based on the dissolved weight of gadolinium sulfate octahydrate powder. It is consistent with the result of the direct sampling from the detector as 334 ± 4 ppm. The spallation neutron measurement and AmBe calibration confirms the shorter capture time constant and higher capture event rate due to the second loading. Therefore, we achieved 1.5 times higher than that of the first loaded phase as expected.

    Scopus

  28. Search for Boosted Dark Matter in Super-Kamiokande with low-energy electrons

    Iovine N., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchene A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

    Proceedings of Science   444 巻   2024年9月

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    出版者・発行元:Proceedings of Science  

    Despite efforts from numerous experiments to grasp the nature of dark matter, no convincing dark matter signal has been observed so far and the very properties of this invisible matter remain unknown. Nevertheless, strong constraints on these properties are set by current observations, particularly for GeV to TeV WIMP-like dark matter particles. In contrast, sub-GeV dark matter scenarios are largely unexplored and still offer promising prospects for dark matter detection. In this contribution, we conduct a search for low-energy electrons scattered by boosted dark matter particles in the Super-Kamiokande detector. In particular, a two-component dark matter scenario is considered, which results in a natural boosting of the non-secluded secondary dark matter particles produced by the decay or annihilation of the dominant cold dark matter component. This work focuses on boosted dark matter from the centre of our Galaxy, with scattered electron energies ranging from a few MeV to a few hundred of MeV. We present the first sensitivities of such low-energy boosted dark matter search using Super-Kamiokande.

    Scopus

  29. Measurement of the kaon to pion production ratio with the Super-Kamiokande

    Tada T., Nakano Y., Koshio Y., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R.

    Proceedings of Science   444 巻   2024年9月

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    出版者・発行元:Proceedings of Science  

    Cosmic-ray muons are generated from the decay of mesons which are secondary particles produced via hadronic interaction between primary cosmic-ray particles and atmospheric nuclei at the upper the atmosphere. The mesons such pions and kaons mostly decay into muons immediately, reflecting the details of the hadronic interactions depending on their energy and lifetime. The modulation of the cosmic-ray muon rate as well as the flux and the atmospheric kaon-to-pion production ratio are important to determine the flux and energy of the atmospheric neutrino. In particular, the kaon-to-pion production ratio r<inf>K/π</inf> is measured with the correlation coefficient α<inf>T</inf> between the cosmic-ray muon rate in the underground detector and the atmospheric temperature. As a result, we obtained the correlation coefficient r<inf>K/π</inf> = 0.85 ± 0.01 (statistical uncertainty only) and r<inf>K/π</inf> = 0.12 ± 0.03 (statistical uncertainty only) using the data taken in 10 years at the Super-Kamiokande detector. In this article, we report the current status of measurement of the modulation of the comic-ray muon and the atmospheric kaon-to-pion production ratio.

    Scopus

  30. Measurement of the charge ratio and polarization of cosmic-ray muon using the tagged decay-e events in Super-Kamiokande

    Nakano Y., Tada T., Kitagawa H., Koshio Y., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y.

    Proceedings of Science   444 巻   2024年9月

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    出版者・発行元:Proceedings of Science  

    Neutrinos and muons from cosmic-ray interactions in the atmosphere originate from mesons, such as pions and kaons, in air-showers. An accuracy of the absolute atmospheric neutrino flux and its flavor ratio are limited due to the uncertainty of meson productions in hadronic interaction models. In order to reduce such uncertainty, measurements of the charge ratio and the polarization of cosmic-ray muons are important as new inputs to theoretical models which simulate the atmospheric neutrino flux. In this proceedings, we present the results of the charge ratio (R) and polarization (P<sup>μ</sup><inf>0</inf>) of cosmic-ray muon measurements using the decay electrons collected from 2008 September to 2022 June by the Super-Kamiokande (SK) detector. We measured muon charge ratio to be R = 1.32±0.02 (stat.+syst.) and the muon polarization at the production location to be P<sup>μ</sup><inf>0</inf> = 0.52±0.01 (stat.+syst.). The SK detector uniquely measured the polarization of cosmic-ray muons with energies more than 1 TeV at sea-level because of its underground location.

    Scopus

  31. Measurement of cosmogenic 9Li in Super-Kamiokande with gadolinium loaded water

    Shinoki M., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

    Proceedings of Science   444 巻   2024年9月

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    出版者・発行元:Proceedings of Science  

    Super-Kamiokande is a large water Cherenkov detector located approximately 1,000 m underground in Kamioka, Japan. The detector is a cylindrical tank 39.3 m in diameter and 41.4 m high, filled with about 50 kton of gadolinium loaded water. We measured <sup>9</sup>Li isotopic nuclei produced by muon spallation using the data taken from 2020 to 2022 by the Super-Kamiokande detector with 0.011% gadolinium concentration in water. Cosmic-ray muons that penetrate the detector form hadron showers in water and secondary hadrons produce unstable radioisotopes through the spallation. Among those spallation products, <sup>9</sup>Li is a long-lived radioactive isotope with a lifetime of about 0.26 seconds. It emits an electron and a neutron at a branching ratio of 50.8%, which is difficult to distinguish from the inverse beta decay caused by electron antineutrinos. Therefore, <sup>9</sup>Li is one of the main background sources in the observation of diffuse supernova neutrino background. In this study, the energy spectrum of the electrons was measured with a threshold at 4.5 MeV which is lowered from the previous result with pure water. We will report the analysis method and results.

    Scopus

  32. First result of a search for Diffuse Supernova Neutrino Background in SK-Gd experiment 査読有り 国際共著 国際誌

    Harada M., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

    Proceedings of Science   444 巻   2024年9月

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    掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:Proceedings of Science  

    Since 2020, Super-Kamiokande (SK) detector has been updated by loading gadolinium (Gd) as a new experimental phase, ‘SK-Gd.’ In the SK-Gd experiment, we can search low-energy electron antineutrinos via inverse-beta decay with efficient neutron identification thanks to high cross-section and high-energy gamma-ray emission of thermal neutron capture on Gd. Until July 2022, the observation is operated with the 0.01% Gd mass concentration. The neutron capture fraction on Gd is about 50% in this situation. In this paper, the first search result for the flux of astrophysical electron antineutrinos for the energy range of O(10) MeV in SK-Gd with a 22.5 × 552 kton·day exposure at 0.01% Gd mass concentration of the initial stage of SK-Gd is reported.

    Scopus

  33. New methods and simulations for cosmogenic induced spallation removal in Super-Kamiokande-IV Open Access

    Locke, S; Coffani, A; Abe, K; Bronner, C; Hayato, Y; Ikeda, M; Imaizumi, S; Ito, H; Kameda, J; Kataoka, Y; Miura, M; Moriyama, S; Nagao, Y; Nakahata, M; Nakajima, Y; Nakayama, S; Okada, T; Okamoto, K; Orii, A; Pronost, G; Sekiya, H; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Yano, T; Hirade, K; Kanemura, Y; Miki, S; Watabe, S; Han, S; Kajita, T; Okumura, K; Tashiro, T; Xia, J; Wang, X; Megias, GD; Bravo-Berguño, D; Labarga, L; Marti, L; Zaldivar, B; Pointon, BW; Blaszczyk, FDM; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Mine, S; Smy, MB; Sobel, HW; Takhistov, V; Weatherly, P; Yankelevich, A; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Bernard, L; Drapier, O; El Hedri, S; Giampaolo, A; Gonin, M; Mueller, TA; Paganini, P; Quilain, B; Santos, AD; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Anthony, LHV; Sztuc, AA; Uchida, Y; Martin, D; Scott, M; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Ospina, N; Mattiazzi, M; Ludovici, L; Nishimura, Y; Maewaka, Y; Cao, S; Friend, M; Hasegawa, T; Ishida, T; Kobayashi, T; Jakkapu, M; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Nakano, Y; Shiozawa, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Kotsar, Y; Ozaki, H; Ali, A; Ashida, Y; Feng, J; Hirota, S; Ichikawa, AK; Kikawa, T; Mori, M; Nakaya, T; Wendell, RA; Yasutome, K; Fernandez, P; McCauley, N; Mehta, P; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Niwa, T; Sato, K; Tsukada, M; Mijakowski, P; Lagoda, J; Lakshmi, SM; Zalipska, J; Jung, CK; Vilela, C; Wilking, MJ; Yanagisawa, C; Jiang, J; Hagiwara, K; Harada, M; Horai, T; Ishino, H; Ito, S; Koshio, Y; Ma, W; Piplani, N; Sakai, S; Kitagawa, H; Barr, G; Barrow, D; Cook, L; Goldsack, A; Samani, S; Wark, D; Nova, F; Boschi, T; Di Lodovico, F; Taani, M; Zsoldos, S; Gao, J; Migenda, J; Yang, JY; Jenkins, SJ; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Okazawa, H; Nakamura, K; Kim, SB; Yu, I; Seo, JW; Nishijima, K; Koshiba, M; Iwamoto, K; Ogawa, N; Yokoyama, M; Martens, K; Vagins, MR; Nakagiri, K; Kuze, M; Izumiyama, S; Yoshida, T; Inomoto, M; Ishitsuka, M; Matsumoto, R; Ohta, K; Shinoki, M; Suganuma, T; Kinoshita, T; Martin, JF; Tanaka, HA; Towstego, T; Akutsu, R; Hartz, M; Konaka, A; de Perio, P; Prouse, NW; Chen, S; Xu, BD; Zhang, Y; Posiadala-Zezula, M; Richards, B; Jamieson, B; Walker, J; Minamino, A; Okamoto, K; Pintaudi, G; Sasaki, R

    PHYSICAL REVIEW D   110 巻 ( 3 )   2024年8月

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    出版者・発行元:Physical Review D  

    Radioactivity induced by cosmic muon spallation is a dominant source of backgrounds for O(10 MeV) neutrino interactions in water Cherenkov detectors. In particular, it is crucial to reduce backgrounds to measure the solar neutrino spectrum and find neutrino interactions from distant supernovae. In this paper we introduce new techniques to locate muon-induced hadronic showers and efficiently reject spallation backgrounds. Applying these techniques to the solar neutrino analysis with an exposure of 2790×22.5 kton·day increases the signal efficiency by 12.6%, approximately corresponding to an additional year of detector running. Furthermore, we present the first spallation simulation at Super-Kamiokande, where we model hadronic interactions using fluka. The agreement between the isotope yields and shower pattern in this simulation and in the data gives confidence in the accuracy of this simulation, and thus opens the door to use it to optimize muon spallation removal in new data with gadolinium-enhanced neutron capture detection.

    DOI: 10.1103/PhysRevD.110.032003

    Open Access

    Web of Science

    Scopus

  34. Second gadolinium loading to Super-Kamiokande Open Access

    Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Jang M.C., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Rogly R., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Uchida Y., Berardi V., Calabria N.F., Catanesi M.G., Radicioni E., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Périssé L., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

    Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment   1065 巻   2024年8月

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    出版者・発行元:Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment  

    The first loading of gadolinium (Gd) into Super-Kamiokande in 2020 was successful, and the neutron capture efficiency on Gd reached 50%. To further increase the Gd neutron capture efficiency to 75%, 26.1 tons of Gd<inf>2</inf>(SO<inf>4</inf>)<inf>3</inf>⋅8H<inf>2</inf>O was additionally loaded into Super-Kamiokande (SK) from May 31 to July 4, 2022. As the amount of loaded Gd<inf>2</inf>(SO<inf>4</inf>)<inf>3</inf>⋅8H<inf>2</inf>O was doubled compared to the first loading, the capacity of the powder dissolving system was doubled. We also developed new batches of gadolinium sulfate with even further reduced radioactive impurities. In addition, a more efficient screening method was devised and implemented to evaluate these new batches of Gd<inf>2</inf>(SO<inf>4</inf>)<inf>3</inf>⋅8H<inf>2</inf>O. Following the second loading, the Gd concentration in SK was measured to be 333.5±2.5 ppm via an Atomic Absorption Spectrometer (AAS). From the mean neutron capture time constant of neutrons from an Am/Be calibration source, the Gd concentration was independently measured to be 332.7 ± 6.8(sys.) ± 1.1(stat.) ppm, consistent with the AAS result. Furthermore, during the loading the Gd concentration was monitored continually using the capture time constant of each spallation neutron produced by cosmic-ray muons, and the final neutron capture efficiency was shown to become 1.5 times higher than that of the first loaded phase, as expected.

    DOI: 10.1016/j.nima.2024.169480

    Open Access

    Scopus

  35. Performance of SK-Gd’s Upgraded Real-time Supernova Monitoring System Open Access

    Kashiwagi Y., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Jang M.C., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Rogly R., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Périssé L., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R.

    Astrophysical Journal   970 巻 ( 1 )   2024年7月

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    出版者・発行元:Astrophysical Journal  

    Among multimessenger observations of the next Galactic core-collapse supernova, Super-Kamiokande (SK) plays a critical role in detecting the emitted supernova neutrinos, determining the direction to the supernova (SN), and notifying the astronomical community of these observations in advance of the optical signal. In 2022, SK has increased the gadolinium dissolved in its water target (SK-Gd) and has achieved a Gd concentration of 0.033%, resulting in enhanced neutron detection capability, which in turn enables more accurate determination of the supernova direction. Accordingly, SK-Gd’s real-time supernova monitoring system has been upgraded. SK_SN Notice, a warning system that works together with this monitoring system, was released on 2021 December 13, and is available through GCN Notices. When the monitoring system detects an SN-like burst of events, SK_SN Notice will automatically distribute an alarm with the reconstructed direction to the supernova candidate within a few minutes. In this paper, we present a systematic study of SK-Gd’s response to a simulated Galactic SN. Assuming a supernova situated at 10 kpc, neutrino fluxes from six supernova models are used to characterize SK-Gd’s pointing accuracy using the same tools as the online monitoring system. The pointing accuracy is found to vary from 3° to 7° depending on the models. However, if the supernova is closer than 10 kpc, SK_SN Notice can issue an alarm with three-degree accuracy, which will benefit follow-up observations by optical telescopes with large fields of view.

    DOI: 10.3847/1538-4357/ad4d8e

    Open Access

    Scopus

  36. Search for Periodic Time Variations of the Solar B 8 Neutrino Flux between 1996 and 2018 in Super-Kamiokande Open Access

    Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Jang M.C., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., MacHado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M.

    Physical Review Letters   132 巻 ( 24 ) 頁: 241803   2024年6月

     詳細を見る

    記述言語:英語   出版者・発行元:Physical Review Letters  

    We report a search for time variations of the solar B8 neutrino flux using 5804 live days of Super-Kamiokande data collected between May 31, 1996, and May 30, 2018. Super-Kamiokande measured the precise time of each solar neutrino interaction over 22 calendar years to search for solar neutrino flux modulations with unprecedented precision. Periodic modulations are searched for in a dataset comprising five-day interval solar neutrino flux measurements with a maximum likelihood method. We also applied the Lomb-Scargle method to this dataset to compare it with previous reports. The only significant modulation found is due to the elliptic orbit of the Earth around the Sun. The observed modulation is consistent with astronomical data: we measured an eccentricity of (1.53±0.35)%, and a perihelion shift of (-1.5±13.5) days.

    DOI: 10.1103/PhysRevLett.132.241803

    Open Access

    Scopus

    PubMed

  37. Solar neutrino measurements using the full data period of Super-Kamiokande-IV Open Access

    Abe, K; Bronner, C; Hayato, Y; Hiraide, K; Hosokawa, K; Ieki, K; Ikeda, M; Imaizumi, S; Iyogi, K; Kameda, J; Kanemura, Y; Kaneshima, R; Kashiwagi, Y; Kataoka, Y; Kato, Y; Kishimoto, Y; Miki, S; Mine, S; Miura, M; Mochizuki, T; Moriyama, S; Nagao, Y; Nakahata, M; Nakano, Y; Nakayama, S; Noguchi, Y; Okada, T; Okamoto, K; Orii, A; Sato, K; Sekiya, H; Shiba, H; Shimizu, K; Shiozawa, M; Sonoda, Y; Suzuki, Y; Takeda, A; Takemoto, Y; Takenaka, A; Tanaka, H; Watanabe, S; Yano, T; Han, S; Kajita, T; Okumura, K; Tashiro, T; Tomiya, T; Wang, R; Wang, X; Yoshida, S; Bravo-Berguño, D; Fernandez, P; Labarga, L; Ospina, N; Zaldivar, B; Pointon, BW; Blaszczyk, FDM; Kachulis, C; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Smy, MB; Sobel, HW; Takhistov, V; Weatherly, P; Yankelevich, A; Ganezer, KS; Hill, J; Jang, MC; Kim, JY; Lee, S; Lim, IT; Moon, DH; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Beauchêne, A; Bernard, L; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Imber, J; Mueller, TA; Paganini, P; Rogly, R; Quilain, B; Santos, A; Nakamura, T; Jang, JS; Machado, LN; Learned, JG; Matsuno, S; Iovine, N; Choi, K; Cao, S; Anthony, LHV; Litchfield, RP; Prouse, N; Marin, D; Scott, M; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Intonti, RA; Radicioni, E; Calabria, NF; De Rosa, G; Langella, A; Collazuol, G; Iacob, F; Lamoureux, M; Mattiazzi, M; Ludovici, L; Gonin, M; Périssé, L; Pronost, G; Fujisawa, C; Maekawa, Y; Nishimura, Y; Okazaki, R; Friend, M; Hasegawa, T; Ishida, T; Jakkapu, M; Kobayashi, T; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Boschi, T; Bhuiyan, N; Burton, GT; Gao, J; Goldsack, A; Katori, T; Di Lodovico, F; Migenda, J; Sedgwick, SM; Ramsden, RM; Taani, M; Xie, Z; Zsoldos, S; Abe, K; Hasegawa, M; Isobe, Y; Kotsar, Y; Miyabe, H; Ozaki, H; Shiozawa, T; Sugimoto, T; Suzuki, AT; Takagi, Y; Takeuchi, Y; Yamamoto, S; Zhong, H; Ashida, Y; Feng, J; Feng, L; Hayashino, T; Hirota, S; Hu, JR; Hu, Z; Jiang, M; Kawaue, M; Kikawa, T; Mori, M; Nakamura, K; Nakaya, T; Wendell, RA; Yasutome, K; Jenkins, SJ; McCauley, N; Mehta, P; Pritchard, A; Tarrant, A; Wilking, MJ; Fukuda, Y; Itow, Y; Menjo, H; Murase, M; Ninomiya, K; Niwa, T; Tsukada, M; Yoshioka, Y; Frankiewicz, K; Lagoda, J; Mandal, M; Mijakowski, P; Prabhu, YS; Zalipska, J; Jiang, J; Jia, M; Jung, CK; Palomino, JL; Santucci, G; Shi, W; Vilela, C; Yanagisawa, C; Fukuda, D; Hagiwara, K; Harada, M; Hino, Y; Horai, T; Ishino, H; Ito, S; Kitagawa, H; Koshio, Y; Ma, W; Nakanishi, F; Piplani, N; Sakai, S; Sakuda, M; Tada, T; Tano, T; Xu, C; Yamaguchi, R; Ishizuka, T; Kuno, Y; Barr, G; Barrow, D; Cook, L; Samani, S; Simpson, C; Wark, D; Holin, AM; Nova, F; Jung, S; Yang, B; Yang, JY; Yoo, J; Fannon, JEP; Kneale, L; Malek, M; McElwee, JM; Stone, O; Thiesse, MD; Thompson, LF; Wilson, ST; Okazawa, H; Lakshmi, SM; Choi, Y; Kim, SB; Kwon, E; Seo, JW; Yu, I; Ichikawa, AK; Nakamura, K; Tairafune, S; Nishijima, K; Eguchi, A; Iwamoto, K; Nakagiri, K; Nakajima, Y; Ogawa, N; Shima, S; Watanabe, E; Yokoyama, M; Calland, RG; Fujita, S; Jesús-Valls, C; Xia, J; Ming, TK; de Perio, P; Martens, K; Murdoch, M; Vagins, MR; Izumiyama, S; Kuze, M; Matsumoto, R; Okajima, Y; Tanaka, M; Yoshida, T; Inomoto, M; Ishitsuka, M; Ito, H; Kinoshita, T; Matsumoto, R; Ohta, K; Ommura, Y; Shinoki, M; Shigeta, N; Suganuma, T; Yamauchi, K; Yoshida, T; Martin, JF; Nantais, CM; Tanaka, HA; Towstego, T; Gaur, R; Gousy-Leblanc, V; Hartz, M; Konaka, A; Li, X; Chen, S; Xu, BD; Zhang, B; Berkman, S; Posiadala-Zezula, M; Boyd, SB; Edwards, R; Hadley, D; Nicholson, M; O'Flaherty, M; Richards, B; Ali, A; Jamieson, B; Walker, J; Amanai, S; Marti, L; Minamino, A; Okamoto, K; Pintaudi, G; Sano, S; Sasaki, R; Suzuki, S; Wada, K

    PHYSICAL REVIEW D   109 巻 ( 9 )   2024年5月

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    出版者・発行元:Physical Review D  

    An analysis of solar neutrino data from the fourth phase of Super-Kamiokande (SK-IV) from October 2008 to May 2018 is performed and the results are presented. The observation time of the dataset of SK-IV corresponds to 2970 days and the total live time for all four phases is 5805 days. For more precise solar neutrino measurements, several improvements are applied in this analysis: lowering the data acquisition threshold in May 2015, further reduction of the spallation background using neutron clustering events, precise energy reconstruction considering the time variation of the PMT gain. The observed number of solar neutrino events in 3.49-19.49 MeV electron kinetic energy region during SK-IV is 65,443-388+390(stat.)±925(syst.) events. Corresponding B8 solar neutrino flux is (2.314±0.014(stat.)±0.040(syst.))×106 cm-2 s-1, assuming a pure electron-neutrino flavor component without neutrino oscillations. The flux combined with all SK phases up to SK-IV is (2.336±0.011(stat.)±0.043(syst.))×106 cm-2 s-1. Based on the neutrino oscillation analysis from all solar experiments, including the SK 5805 days dataset, the best-fit neutrino oscillation parameters are sin2θ12,solar=0.306±0.013 and Δm21,solar2=(6.10-0.81+0.95)×10-5 eV2, with a deviation of about 1.5σ from the Δm212 parameter obtained by KamLAND. The best-fit neutrino oscillation parameters obtained from all solar experiments and KamLAND are sin2θ12,global=0.307±0.012 and Δm21,global2=(7.50-0.18+0.19)×10-5 eV2.

    DOI: 10.1103/PhysRevD.109.092001

    Open Access

    Web of Science

    Scopus

  38. Atmospheric neutrino oscillation analysis with neutron tagging and an expanded fiducial volume in Super-Kamiokande I-V Open Access

    Wester T., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Catanesi M.G., Radicioni E., Calabria N.F., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R., Friend M., Hasegawa T.

    Physical Review D   109 巻 ( 7 )   2024年4月

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    出版者・発行元:Physical Review D  

    We present a measurement of neutrino oscillation parameters with the Super-Kamiokande detector using atmospheric neutrinos from the complete pure-water SK I-V (April 1996-July 2020) dataset, including events from an expanded fiducial volume. The dataset corresponds to 6511.3 live days and an exposure of 484.2 kiloton-years. Measurements of the neutrino oscillation parameters Δm322, sin2θ23, sin2θ13, δCP, and the preference for the neutrino mass ordering are presented with atmospheric neutrino data alone, and with constraints on sin2θ13 from reactor neutrino experiments. Our analysis including constraints on sin2θ13 favors the normal mass ordering at the 92.3% level.

    DOI: 10.1103/PhysRevD.109.072014

    Open Access

    Scopus

  39. Measurement of the neutrino-oxygen neutral-current quasielastic cross section using atmospheric neutrinos in the SK-Gd experiment Open Access

    Sakai S., Abe K., Bronner C., Hayato Y., Hiraide K., Hosokawa K., Ieki K., Ikeda M., Kameda J., Kanemura Y., Kaneshima R., Kashiwagi Y., Kataoka Y., Miki S., Mine S., Miura M., Moriyama S., Nakano Y., Nakahata M., Nakayama S., Noguchi Y., Sato K., Sekiya H., Shiba H., Shimizu K., Shiozawa M., Sonoda Y., Suzuki Y., Takeda A., Takemoto Y., Tanaka H., Yano T., Han S., Kajita T., Okumura K., Tashiro T., Tomiya T., Wang X., Yoshida S., Fernandez P., Labarga L., Ospina N., Zaldivar B., Pointon B.W., Kearns E., Raaf J.L., Wan L., Wester T., Bian J., Griskevich N.J., Locke S., Smy M.B., Sobel H.W., Takhistov V., Yankelevich A., Hill J., Jang M.C., Lee S.H., Moon D.H., Park R.G., Bodur B., Scholberg K., Walter C.W., Beauchêne A., Drapier O., Giampaolo A., Mueller T.A., Santos A.D., Paganini P., Quilain B., Nakamura T., Jang J.S., Machado L.N., Learned J.G., Choi K., Iovine N., Cao S., Anthony L.H.V., Martin D., Prouse N.W., Scott M., Sztuc A.A., Uchida Y., Berardi V., Calabria N.F., Catanesi M.G., Radicioni E., Langella A., De Rosa G., Collazuol G., Iacob F., Mattiazzi M., Ludovici L., Gonin M., Pronost G., Fujisawa C., Maekawa Y., Nishimura Y., Okazaki R., Akutsu R.

    Physical Review D   109 巻 ( 1 )   2024年1月

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    出版者・発行元:Physical Review D  

    We report the first measurement of the atmospheric neutrino-oxygen neutral-current quasielastic (NCQE) cross section in the gadolinium-loaded Super-Kamiokande (SK) water Cherenkov detector. In June 2020, SK began a new experimental phase, named SK-Gd, by loading 0.011% by mass of gadolinium into the ultrapure water of the SK detector. The introduction of gadolinium to ultrapure water has the effect of improving the neutron-tagging efficiency. Using a 552.2 day dataset from August 2020 to June 2022, we measure the NCQE cross section to be 0.74±0.22(stat)-0.15+0.85(syst)×10-38 cm2/oxygen in the energy range from 160 MeV to 10 GeV, which is consistent with the atmospheric neutrino-flux-averaged theoretical NCQE cross section and the measurement in the SK pure-water phase within the uncertainties. Furthermore, we compare the models of the nucleon-nucleus interactions in water and find that the binary cascade model and the Liège intranuclear cascade model provide a somewhat better fit to the observed data than the Bertini cascade model. Since the atmospheric neutrino-oxygen NCQE reactions are one of the main backgrounds in the search for diffuse supernova neutrino background (DSNB), these new results will contribute to future studies - and the potential discovery - of the DSNB in SK.

    DOI: 10.1103/PhysRevD.109.L011101

    Open Access

    Scopus

▼全件表示

講演・口頭発表等 4

  1. LHC通算積分ルミノシティ500 /fb の達成と3000 /fb への展望 — ATLAS検出器の運転およびアップグレードの現場より

    泉山将大

    日本物理学会 2026年春季大会  2026年3月23日 

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    開催年月日: 2026年3月

    記述言語:日本語   会議種別:口頭発表(招待・特別)  

  2. Finalization of the Sector Logic ATCA blade design for the ATLAS Level-0 muon trigger at HL-LHC 国際共著 国際会議

    Shota Izumiyama, ATLAS TDAQ Collaboration

    TWEPP2025 Topical Workshop on Electronics for Particle Physics  2025年10月10日 

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    開催年月日: 2025年10月

    記述言語:英語   会議種別:口頭発表(一般)  

    開催地:Crete, Greece   国名:ギリシャ共和国  

  3. Overview of ATLAS muon detectors: status and performance 国際共著 国際会議

    Shota Izumiyama, ATLAS Collaboration

    EPS-HEP 2025  2025年7月9日 

     詳細を見る

    開催年月日: 2025年7月

    記述言語:英語   会議種別:ポスター発表  

    開催地:Marseille, France   国名:フランス共和国  

  4. 高輝度LHC-ATLAS実験に向けた初段ミューオントリガーの為のセクターロジック基板の設計と量産への展望

    泉山将大,青木雅人,麻田晴香,飯澤知弥,石野雅也,大隅悠矢,大坪航,奥村恭幸,糀翔太,河本地弘,神吉陽介,久世正弘,藏重久弥,近藤翔太,齋藤智之,佐倉慶汰,佐々木修,佐藤正大,佐野友麻,庄子正剛,須江祐貴,須部実咲,田上理沙子,田中碧人,田中亮祐,千葉公太郎,陳詩遠,張力,戸本誠,中川徹郎,長坂錬,中浜優,成川佳史,橋本大輔,橋本真理子,長谷川庸司,林雄一郎,堀井泰之,前田順平,牧和真,牧田藍瑠,間仁田省吾,水落永遠,水引龍吾,山口洋平,山口凜太郎,山崎祐司,山下恵理香,和田有咲,Chaowaroj Wanotayaroj,ATLAS日本トリガーグループ

    日本物理学会 第80回年次大会  2025年9月16日 

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    開催年月日: 2025年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    開催地:広島   国名:日本国  

科研費 3

  1. 現象を視る:ミューオンの即時検出技術で拓く素粒子現象の探求と応用

    研究課題/研究課題番号:25H01291  2025年4月 - 2030年3月

    科学研究費助成事業  学術変革領域研究(A)

    齋藤 智之, 山崎 祐司, 泉山 将大

      詳細を見る

    担当区分:研究分担者  資金種別:競争的資金

    本研究は、アトメートルスケールの素粒子現象を『視る』ための技術の革新と、その応用展開を通じて、ミューオン計測技術の総合的な進化をめざすものである。高速ミューオン計測技術の開発により、素粒子現象のリアルタイム可視化を実現し、素粒子・宇宙分野での学理的理解を深化させる。また、数理情報処理を組み合わせることで、将来にわたって世界を先導する技術基盤の確立を図る。加えて、その開発技術を異なる分野へ展開し、計測技術における性能指標(機能・感度・解像度・速度)の抜本的な向上を実現する。ミューオンイメージング技術を用いた巨大自然物構造物の計測応用を通じて、今後の実用化・社会実装に向けた可能性を拡げていく。

  2. ヒッグスの自己相互作用解明に向けた次世代の機械学習を利用した事象分別器の開発

    研究課題/研究課題番号:25K17410  2025年4月 - 2028年3月

    科学研究費助成事業  若手研究

    泉山 将大

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    担当区分:研究代表者  資金種別:競争的資金

    配分額:4810000円 ( 直接経費:3700000円 、 間接経費:1110000円 )

    電弱相互作用の構造を形作るヒッグス粒子について、その自己結合の理解を深める為には LHC におけるヒッグス粒子の対生成事象探索が有効である。この事象の半数以上は 4つの b ジェットを終状態に持つものの、この信号は複数ジェットが b ジェットに誤同定される事による背景事象に埋もれてしまう為、b ジェットの同定性能の向上が鍵である。本研究では、この b ジェットの同定性能の改善を目指し、機械学習を応用した分別器および運動量などを再構成するアルゴリズムを開発する。開発したジェット分別器を、ATLAS 実験におけるヒッグス粒子対の生成事象探索に導入し探索を進める。

  3. 将来の巨大水チェレンコフ検出器のためのタイミング同期システムの開発

    研究課題/研究課題番号:23KJ0890  2023年4月 - 2025年3月

    科学研究費助成事業  特別研究員奨励費

    泉山 将大

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    担当区分:研究代表者  資金種別:競争的資金

    配分額:2000000円 ( 直接経費:2000000円 )

    本研究では、将来の大型水チェレンコフ検出器の為のタイミング同期システムの開発を行う。将来の水チェレンコフ検出器であるハイパーカミオカンデは多くの光センサを直径・高さ70mの水槽内壁に取り付けたものであり、内部で反応するニュートリノ起因の微弱な光を検出する。ニュートリノ事象をきちんと識別する為には、各光センサの時刻が揃っている必要があり、その為に同期システムが必要となる。これと同時に現行の検出器であるスーパーカミオカンデにて実際に取得されるニュートリノ事象を解析し、超新星背景ニュートリノを探索する。
    本研究課題では、ニュートリノ物理の為の将来の水チェレンコフ検出器に向けた電子回路の同期システムにかかわる研究に関連して実際のシステム開発と、また現行の水チェレンコフ検出器であるスーパーカミオカンデ検出器におけるデータ解析を進めてきた。本年度は、主に実際の検出器におけるニュートリノ反応の解析に注力した。
    特に、水チェレンコフ検出器の検出限界に近い低エネルギーの事象に着目し、原子炉由来のニュートリノの解析を進め、その成果を国際会議で発表した。低エネルギー領域では、光子ひとつひとつが検出器内のセンサーで捉えられ、各光子のタイミング情報が重要になる。この為、各センサー間のタイミング同期や、センサー自体のタイミング分解能が、実際の解析に及ぼす影響を考慮しながら解析を進めた。
    これまで原子炉ニュートリノは、水チェレンコフ検出器で捉えるにはエネルギーが小さく困難であるとされていた。しかし、スーパーカミオカンデのガドリニウム導入によるアップグレードにより、検出の可能性を見出した。昨年度から引き続き解析を進め、実際に観測する事ができた。
    スーパーカミオカンデでは、超新星背景ニュートリノの観測を目指しているが、まだ観測には至っていない。いずれも反電子ニュートリノの種類として観測され得て、今回の結果は、従来よりも低いエネルギー領域での観測であり、スーパーカミオカンデ検出器が反電子ニュートリノを検出することができる事を実際に示した例であり、今後の観測また将来の検出器への発展への道筋を示した。