研究者詳細 - 毛受　弘彰

Search for proton decay via p → e+π0 and p → μ+π0 with an enlarged fiducial volume in Super-Kamiokande I-IV 査読有り国際共著国際誌 Open Access

Takenaka, A; Abe, K; Bronner, C; Hayato, Y; Ikeda, M; Imaizumi, S; Ito, H; Kameda, J; Kataoka, Y; Kato, Y; Kishimoto, Y; Marti, L; Miura, M; Moriyama, S; Mochizuki, T; 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; Tanaka, H; Yano, T; Akutsu, R; Han, S; Kajita, T; Okumura, K; Tashiro, T; Wang, R; Xia, J; Bravo-Berguño, D; Labarga, L; Fernandez, P; Zaldivar, B; Blaszczyk, FDM; Kearns, E; Raaf, JL; Stone, JL; Wan, L; Wester, T; Pointon, BW; Bian, J; Griskevich, NJ; Kropp, WR; Locke, S; Mine, S; Smy, MB; Sobel, HW; Takhistov, V; Weatherly, P; Ganezer, KS; Hill, J; Kim, JY; Lim, IT; Park, RG; Bodur, B; Scholberg, K; Walter, CW; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Gonin, M; Mueller, TA; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Learned, JG; Matsuno, S; Anthony, LHV; Litchfield, RP; Sztuc, AA; Uchida, Y; Berardi, V; Catanesi, MG; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Ospina, N; Ludovici, L; Nishimura, Y; Cao, S; Friend, M; Hasegawa, T; Ishida, T; Jakkapu, M; Kobayashi, T; Matsubara, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Hasegawa, M; Isobe, Y; Miyabe, H; Nakano, Y; Shiozawa, T; Sugimoto, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Ali, A; Ashida, Y; Feng, J; Hirota, S; Ichikawa, AK; Jiang, M; Kikawa, T; Mori, M; Nakamura, KE; Nakaya, T; Wendell, RA; Yasutome, K; McCauley, N; Mehta, P; Pritchard, A; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Niwa, T; Sato, K; Taani, M; Tsukada, M; Mijakowski, P; Frankiewicz, K; Jung, CK; Santucci, G; Vilela, C; Wilking, MJ; Yanagisawa, C; Fukuda, D; Harada, M; Hagiwara, K; Horai, T; Ishino, H; Ito, S; Koshio, Y; Ma, K; Piplani, N; Sakai, S; Sakuda, M; Takahira, Y; Xu, C; Kuno, Y; Barr, G; Barrow, D; Cook, L; Simpson, C; Wark, D; Nova, F; Boschi, T; Di Lodovico, F; Segwick, SM; Zsoldos, S; Yang, JY; Jenkins, SJ; McElwee, JM; Thiesse, MD; Thompson, LF; Okazawa, H; Choi, Y; Kim, SB; Yu, I; Nishijima, K; Koshiba, M; Iwamoto, K; Ogawa, N; Yokoyama, M; Goldsack, A; Martens, K; Vagins, MR; Kuze, M; Tanaka, M; Yoshida, T; Inomoto, M; Ishitsuka, M; Matsumoto, R; Ohta, K; Shinoki, M; Martin, JF; Nantais, CM; Tanaka, HA; Towstego, T; Hartz, M; Konaka, A; de Perio, P; Prouse, NW; Chen, S; Xu, BD; Posiadala-Zezula, M; Richards, B; Jamieson, B; Walker, J; Minamino, A; Okamoto, K; Pintaudi, G; Sasaki, R

PHYSICAL REVIEW D 102 巻 ( 11 ) 2020年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review D

We have searched for proton decay via p→e+π0 and p→μ+π0 modes with the enlarged fiducial volume data of Super-Kamiokande from April 1996 to May 2018, which corresponds to 450 kton·years exposure. We have accumulated about 25% more livetime and enlarged the fiducial volume of the Super-Kamiokande detector from 22.5 kton to 27.2 kton for this analysis, so that 144 kton·years of data, including 78 kton·years of additional fiducial volume data, has been newly analyzed. No candidates have been found for p→e+π0 and one candidate remains for p→μ+π0 in the conventional 22.5 kton fiducial volume and it is consistent with the atmospheric neutrino background prediction. We set lower limits on the partial lifetime for each of these modes: τ/B(p→e+π0)>2.4×1034 years and τ/B(p→μ+π0)>1.6×1034 years at 90% confidence level.

DOI： 10.1103/PhysRevD.102.112011

Indirect search for dark matter from the Galactic Center and halo with the Super-Kamiokande detector 査読有り国際共著国際誌 Open Access

Abe, K; Bronner, C; Haga, Y; Hayato, Y; Ikeda, M; Imaizumi, S; Ito, H; Iyogi, K; Kameda, J; Kataoka, Y; Kato, Y; Kishimoto, Y; Marti, L; Miura, M; Moriyama, S; Mochizuki, T; Nagao, Y; Nakahata, M; Nakajima, Y; Nakajima, T; Nakayama, S; Okada, T; Okamoto, K; Orii, A; Pronost, G; Sekiya, H; Shiozawa, M; Sonoda, Y; Takeda, A; Takenaka, A; Tanaka, H; Tasaka, S; Tomura, T; Ueno, K; Yano, T; Yokozawa, T; Akutsu, R; Han, S; Irvine, T; Kajita, T; Kametani, ; Lee, KP; McLachlan, T; Okumura, K; Richard, E; Tashiro, T; Wang, R; Xia, J; Bravo-Berguño, D; Labarga, L; Fernandez, P; Blaszczyk, FDM; Gustafson, J; Kachulis, C; Kearns, E; Raaf, JL; Stone, JL; Sulak, LR; Sussman, S; Wan, L; Wester, T; Berkman, S; Tobayama, S; Bian, J; Carminati, G; Elnimr, M; Griskevich, NJ; Kropp, WR; Locke, S; Mine, S; Renshaw, A; Smy, MB; Sobel, HW; Takhistov, ; Weatherly, P; Hartfiel, BL; Hill, J; Keig, WE; Hong, N; Kim, JY; Lim, IT; Park, RG; Akiri, T; Bodur, B; Himmel, A; Li, Z; O'Sullivan, E; Scholberg, K; Walter, CW; Wongjirad, T; Coffani, A; Drapier, O; El Hedri, S; Giampaolo, A; Gonin, M; Imber, J; Mueller, TA; Paganini, P; Quilain, B; Ishizuka, T; Nakamura, T; Jang, JS; Choi, K; Learned, JG; Matsuno, S; Smith, SN; Amey, J; Anthony, LH; Litchfield, RP; Sztuc, AA; Uchida, Y; Wascko, MO; Berardi, ; Catanesi, MG; Intonti, RA; Radicioni, E; Calabria, NF; Machado, LN; De Rosa, G; Collazuol, G; Iacob, F; Lamoureux, M; Ospina, N; Ludovici, L; Boschi, T; Di Lodovico, F; Sedgwick, SM; Zsoldos, S; Nishimura, Y; Cao, S; Friend, M; Hasegawa, T; Ishida, T; Ishii, T; Kobayashi, T; Nakadaira, T; Nakamura, K; Oyama, Y; Sakashita, K; Sekiguchi, T; Tsukamoto, T; Abe, K; Hasegawa, M; Isobe, Y; Miyabe, H; Nakano, Y; Shiozawa, T; Sugimoto, T; Suzuki, AT; Takeuchi, Y; Yamamoto, S; Ali, A; Ashida, Y; Hayashino, T; Hiraki, T; Hirota, S; Huang, K; Ieki, K; Jiang, M; Kikawa, T; Mori, M; Murakami, A; Nakamura, KE; Nakaya, T; Patel, ND; Suzuki, K; Takahashi, S; Tateishi, K; Wendell, RA; McCauley, N; Mehta, P; Pritchard, A; Tsui, KM; Fukuda, Y; Itow, Y; Menjo, H; Mitsuka, G; Murase, M; Muto, F; Niwa, T; Sato, K; Suzuki, T; Taani, M; Tsukada, M; Mijakowski, P; Frankiewicz, K; Hignight, J; Jung, CK; Li, X; Palomino, JL; Santucci, G; Vilela, C; Wilking, MJ; Yanagisawa, C; Fukuda, D; Hagiwara, K; Harada, M; Horai, T; Ishino, H; Ito, S; Kayano, T; Kibayashi, A; Koshio, Y; Ma, W; Mori, T; Nagata, H; Piplani, N; Sakuda, M; Seiya, S; Takahira, Y; Xu, C; Yamaguchi, R; Kuno, Y; Barr, G; Barrow, D; Cook, L; Simpson, C; Wark, D; Nova, F; Tacik, R; Yang, JY; Cole, A; Jenkins, SJ; McElwee, J; Thiesse, M; Thompson, L; Okazawa, H; Kim, SB; Choi, Y; Ito, K; Nishijima, K; Iwamoto, K; Koshiba, M; Suda, Y; Yokoyama, M; Calland, RG; Goldsack, A; Martens, K; Murdoch, M; Suzuki, Y; Vagins, MR; Hamabe, D; Kuze, M; Okajima, Y; Tanaka, M; Yoshida, T; Inomoto, M; Ishitsuka, M; Matsumoto, R; Ohta, K; Shinoki, M; Martin, JF; Nantais, CM; Tanaka, HA; Towstego, T; Hartz, M; Konaka, A; de Perio, P; Prouse, NW; Chen, S; Xu, BD; Zhang, Y; Richards, B; Connolly, K; Wilkes, RJ; Jamieson, B; Walker, J; Giorgio, P; Minamino, A; Pintaudi, G

PHYSICAL REVIEW D 102 巻 ( 7 ) 2020年10月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Physical Review D

We present a search for an excess of neutrino interactions due to dark matter in the form of weakly interacting massive particles (WIMPs) annihilating in the Galactic center or halo based on the data set of Super-Kamiokande-I, -II, -III and -IV taken from 1996 to 2016. We model the neutrino flux, energy, and flavor distributions assuming WIMP self-annihilation is dominant to νν¯, μ+μ-, bb¯, or W+W-. The excess is in comparison to atmospheric neutrino interactions which are modeled in detail and fit to data. Limits on the self-annihilation cross section σ are derived for WIMP masses in the range 1 GeV to 10 TeV, reaching as low as 9.6×10-23 cm3 s-1 for 5 GeV WIMPs in bb¯ mode and 1.2×10-24 cm3 s-1 for 1 GeV WIMPs in νν¯ mode. The obtained sensitivity of the Super-Kamiokande detector to WIMP masses below several tens of GeV is the best among similar indirect searches to date.

DOI： 10.1103/PhysRevD.102.072002

Update of the atmospheric neutrino flux simulation ATMNC for next-generation neutrino experiment 国際共著国際誌

Sato K., Itow Y., Menjo H., Honda M.

16TH INTERNATIONAL CONFERENCE ON TOPICS IN ASTROPARTICLE AND UNDERGROUND PHYSICS (TAUP 2019) 1468 巻 2020年

LHCf program for run III 国際共著国際誌 Open Access

Tiberio A., Adriani O., Berti E., Bonechi L., Bongi M., D’Alessandro R., Detti S., Haguenauer M., Itow Y., Kasahara K., Menjo H., Muraki Y., Ohashi K., Papini P., Ricciarini S., Sako T., Sakurai N., Sato K., Tamura T., Torii S., Tricomi A., Turner W.C., Ueno M.

Proceedings of Science 382 巻 2020年

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）出版者・発行元：Proceedings of Science

The LHC-forward (LHCf) experiment has measured the very forward neutral particle production cross section in proton-proton and proton-lead collisions at the LHC up to √s = 13 TeV and √sN N = 8.16 TeV, respectively. The experiment employs two independent detectors placed on opposite sides along the beam line approximately 140 meters away from the interaction point of the ATLAS experiment (IP1). The detectors are able to measure neutral particles with pseudorapidity greater than 8.4, up to zero-degree. These measurements are extremely useful for the calibration of the hadronic interaction models used to simulate the atmospheric showers of secondary particles induced from an high energy cosmic ray. Decreasing the uncertainty between different models it is possible to improve the precision of the high energy cosmic rays measurements. In this contribution the LHCf physics motivation for the Run III of LHC are discussed. The beam parameters and the expected operation time needed for our minimum physics program are described for both p-p run at 14 TeV and p-O run at 9.9 TeV. Finally, a brief summary of the ongoing upgrade on the Arm2 detector is given.

DOI： 10.22323/1.382.0089

Recent results from the LHCf and RHICf experiments 国際共著国際誌 Open Access

Itow, Y; Masuda, K; Menjo, H; Muraki, Y; Ohashi, K; Sato, K; Ueno, M; Zhou, QD; Sako, T; Kasahara, K; Suzuki, T; Torii, S; Tamura, T; Sakurai, N; Haguenauer, M; Turner, WC; Adriani, O; Berti, E; Bonechi, L; Bongi, M; D'Alessandro, R; Papini, P; Ricciarini, S; Tiberio, A; Tricomi, A; Goto, Y; Nakagawa, I; Seidl, R; Park, JS; Kim, MH; Tanida, K; Hong, B

XX INTERNATIONAL SYMPOSIUM ON VERY HIGH ENERGY COSMIC RAY INTERACTIONS (ISVHECRI 2018) 208 巻 2019年

Transverse single spin asymmetry for very forward π0 production in polarized proton-proton collisions at √s=510 GeV 国際共著国際誌 Open Access

Kim, MH; Hong, B; Goto, Y; Nakagawa, I; Seidl, R; Park, JS; Tanida, K; Itow, Y; Menjo, H; Sato, K; Ueno, M; Zhou, QD; Sako, T; Kasahara, K; Suzuki, T; Torii, S; Sakurai, N; Adriani, O; Bonechi, L; Berti, E; D'Alessandro, R; Tricomi, A

XX INTERNATIONAL SYMPOSIUM ON VERY HIGH ENERGY COSMIC RAY INTERACTIONS (ISVHECRI 2018) 208 巻 2019年

Latest results of the LHCf experiment 国際共著国際誌 Open Access

Berti E., Adriani O., Bonechi L., Bongi M., D'Alessandro R., Castellini G., Haguenauer M., Itow Y., Kasahara K., Matsubara Y., Menjo H., Muraki Y., Ohashi K., Papini P., Ricciarini S., Sako T., Sakurai N., Sato K., Shimizu Y., Silveri L., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W.C., Ueno M., Yoshida K.

Proceedings of Science 364 巻 2019年

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）出版者・発行元：Proceedings of Science

The LHCf experiment is designed to provide precise measurements of the production spectra relative to neutral particles produced in the very forward region by high energy proton-proton and proton-ion collisions. This information is necessary in order to test and tune hadronic interaction models used by ground-based cosmic rays experiments. In order to reach this goal, LHCf makes use of two small sampling calorimeters installed in the LHC tunnel at ±140 m from IP1, both able to detect neutral particles having pseudo-rapidity η > 8.4. In LHC Run II, LHCf acquired data relative to p-p collisions at √s = 13 TeV and p-Pb collisions at √sNN = 8.1 TeV. In this paper, we discuss the results obtained from p-p collisions at √s = 13 TeV, focusing in particular on photon and neutron production, the two analyses already published by the collaboration.

DOI： 10.22323/1.364.0034

The LHCf experiment: Recent physics results 国際共著国際誌 Open Access

Berti E., Adriani O., Bonechi L., Bongi M., D'Alessandro R., Haguenauer M., Itow Y., Kasahara K., Makino Y., Masuda K., Menjo H., Muraki Y., Ohashi K., Papini P., Ricciarini S., Sako T., Sakurai N., Sato K., Shinoda M., Suzuki T., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W.C., Ueno M., Zhou Q.D.

Proceedings of Science 340 巻 2019年

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）出版者・発行元：Proceedings of Science

The main aim of the LHCf experiment is to provide precise measurements of the production spectra relative to neutral particles produced in the very forward region by high energy protonproton and proton-ion collisions. This information is necessary in order to test and tune hadronic interaction models used by ground-based cosmic rays experiments. In order to reach this goal, LHCf makes use of two small sampling calorimeters installed in the LHC tunnel at ±140 m from IP1, able to detect neutral particles having pseudo-rapidity η > 8:4. After the operations relative to p-p collisions at √s = 13 TeV, the collaboration focused the activity on the study of forward photons and neutrons production at this energy. In this paper, we discuss the recent results relative to the photons analysis, regarding, in particular, the inclusive production cross section, the role of diffractive and non-diffractive processes in forward photons production (investigated thanks to the LHCf-ATLAS joint analysis) and the forward differential energy flow.

DOI： 10.22323/1.340.0207

The energy spectrum of forward photons measured by the RHICf experiment in vs = 510 GeV proton-proton collisions 国際共著国際誌 Open Access

Sato K., Itow Y., Menjo H., Ueno M., Ohashi K., Sako T., Goto Y., Nakagawa I., Saidl R., Park J.S., Kim M.H., Hong B., Tanida K., Torii S., Kasahara K., Sakurai N., Adriani O., D'Alessandro R., Bonechi L., Berti E., Tricomi A.

Proceedings of Science 358 巻 2019年

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）出版者・発行元：Proceedings of Science

The Relativistic Heavy Ion Collider forward (RHICf) experiment aims at understanding the high-energy hadronic interaction by measuring the cross sections of very forward neutral particles in proton-proton collisions at vs = 510 GeV. For the analysis of the photon measurement, the trigger efficiency and the particle identification performance are studied by using the Monte Carlo simulation data and the experimental data. In the RHICf operation, two kinds of trigger modes (Shower, HighEM) were implemented. The trigger efficiency of the Shower trigger is 100% for photons with the energies more than 20 GeV. The HighEM trigger is designed to detect high energy photons effectively, and the trigger efficiency of the HighEM trigger is 90% for photons with the energies more than 130 GeV. The correction factor for the photon identification is calculated by using the efficiency and purity. It is found that this correction does not make a sizeable effect on the shape of the energy spectrum because the energy dependency of the factor is small.

DOI： 10.22323/1.358.0413

MC study for the effect of diffractive events on air shower developments 国際誌 Open Access

Ohashi K., Menjo H., Itow Y.

Proceedings of Science 356 巻 2019年

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）出版者・発行元：Proceedings of Science

The origin of ultra-high energy cosmic rays is unknown and the mass composition is one of the key observables to understand the origin. The mass composition is estimated by comparing a prediction of the depth of maximum of shower developments, Xmax, with experimental data, how-ever, the Xmax prediction depends on the choice of hadronic interaction modes in the simulation. One of the proposed sources of the difference is the different modeling of diffractive collisions among the models. In this work, we estimate the effect of detail of diffractive collisions at the first interaction of cosmic-rays with atmospheric nuclei on the air shower developments by using the air shower simulation package COSMOS 8.035. The results show that the modeling of diffractive collisions at the first interaction is not the main source of the model discrepancies of the Xmax prediction.

DOI： 10.22323/1.356.0026

Measurement of inclusive forward neutron production cross section in proton-proton collisions at √s=13 TeV with the LHCf Arm2 detector 査読有り Open Access

Adriani, O; Berti, E; Bonechi, L; Bongi, M; D'Alessandro, R; Detti, S; Haguenauer, M; Itow, Y; Kasahara, K; Makino, Y; Masuda, K; Menjo, H; Muraki, Y; Ohashi, K; Papini, P; Ricciarini, S; Sako, T; Sakurai, N; Sato, K; Shinoda, M; Suzuki, T; Tamura, T; Tiberio, A; Torii, S; Tricomi, A; Turner, WC; Ueno, M; Zhou, QD

JOURNAL OF HIGH ENERGY PHYSICS 2018 巻 ( 11 ) 2018年11月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of High Energy Physics

In this paper, we report the measurement relative to the production of forward neutrons in proton-proton collisions at s=13 TeV obtained using the LHCf Arm2 detector at the Large Hadron Collider. The results for the inclusive differential production cross section are presented as a function of energy in three different pseudorapidity regions: η > 10.76, 8.99 < η < 9.22 and 8.81 < η < 8.99. The analysis was performed using a data set acquired in June 2015 that corresponds to an integrated luminosity of 0.194 nb−1. The measurements were compared with the predictions of several hadronic interaction models used to simulate air showers generated by Ultra High Energy Cosmic Rays. None of these generators showed good agreement with the data for all pseudorapidity intervals. For η > 10.76, no model is able to reproduce the observed peak structure at around 5 TeV and all models underestimate the total production cross section: among them, QGSJET II-04 shows the smallest deficit with respect to data for the whole energy range. For 8.99 < η < 9.22 and 8.81 < η < 8.99, the models having the best overall agreement with data are SIBYLL 2.3 and EPOS-LHC, respectively: in particular, in both regions SIBYLL 2.3 is able to reproduce the observed peak structure at around 1.5–2.5 TeV.[Figure not available: see fulltext.].

DOI： 10.1007/JHEP11(2018)073

RHIC forward experiment to study √ s dependence of forward particle production 国際共著国際誌 Open Access

Sako T., Adriani O., Bonechi L., D'Alessandro R., Goto Y., Itow Y., Kasahara K., Kim M., Makino Y., Matsubayashi E., Menjo H., Nakagawa I., Park J., Sakurai N., Sato K., Seidl R., Shinoda M., Suzuki T., Tanida K., Torii S., Tricomi A., Ueno M., Zhou Q.D.

EPJ Web of Conferences 145 巻 2017年6月

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）出版者・発行元：EPJ Web of Conferences

The Relativistic Heavy Ion Collider forward experiment is ready to take data in the RHIC Run2017 √ s = 510 GeV p-p collisions using the LHCf Arm1 detector. New accelerator data are valuable to verify the Feynman scaling of FX1 production and to study the evolution of the break of scaling in neutron production. Using the transversely polarized proton beam, asymmetric production of forward neutrons is precisely measured. That is useful to understand the fundamental meson exchange in the proton-proton collisions.

DOI： 10.1051/epjconf/201614510005

Performance study for the photon measurements of the upgraded LHCf calorimeters with Gd2SiO5 (GSO) scintillators 査読有り国際共著国際誌

Makino, Y; Tiberio, A; Adriani, O; Berti, E; Bonechi, L; Bongi, M; Caccia, Z; D'Alessandro, R; Del Prete, M; Detti, S; Haguenauer, M; Itow, Y; Iwata, T; Kasahara, K; Masuda, K; Matsubayashi, E; Menjo, H; Mitsuka, G; Muraki, Y; Papini, P; Ricciarini, S; Sako, T; Sakurai, N; Suzuki, T; Tamura, T; Torii, S; Tricomi, A; Turner, WC; Ueno, M; Zhou, QD

JOURNAL OF INSTRUMENTATION 12 巻 ( 3 ) 2017年3月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Journal of Instrumentation

The Large Hadron Collider forward (LHCf) experiment was motivated to understand the hadronic interaction processes relevant to cosmic-ray air shower development. We have developed radiation-hard detectors with the use of Gd2SiO5 (GSO) scintillators for proton-proton √s = 13 TeV collisions. Calibration of such detectors for photon measurement has been completed at the CERN SPS T2-H4 line in 2015 using electron beams of 100-250 GeV and muon beams of 150-250 GeV . After the channel-by-channel absolute energy calibration, the energy resolution of the calorimeters is confirmed to be better than 3% for electrons with energy above 100 GeV . The position dependence of the energy scale of the calorimeters was reduced to the level of 1% after the corrections for scintillator nonuniformity and the shower leakage effect. The position resolution of the new shower imaging detector, a GSO-bar hodoscope interleaved in the calorimeter, was 100 μm for 200 GeV electrons. The experimental results are well explained by Monte Carlo simulations. We have confirmed that the new detectors meet the requirement of the LHCf experiment at √s = 13 TeV.

DOI： 10.1088/1748-0221/12/03/P03023

The LHCf experiment: Forward particles production spectra at LHC 査読有り国際共著国際誌

Berti E., Adriani O., Bonechi L., Bongi M., Castellini G., D'Alessandro R., Haguenauer M., Itow Y., Iwata Y., Kasahara K., Makino Y., Masuda K., Matsubayashi E., Menjo H., Muraki Y., Papini P., Ricciarini S., Sako T., Suzuki T., Tamura T., Tiberio A., Torii S., Tricomi A., Turner W.C., Ueno M., Zhou Q.D.

Nuovo Cimento della Societa Italiana di Fisica C 40 巻 ( 1 ) 2017年1月

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）出版者・発行元：Nuovo Cimento della Societa Italiana di Fisica C

The LHC forward (LHCf) experiment consists of two small sampling calorimeters installed in the LHC tunnel at ±140 from IP1, so that it can detect neutral particles produced by p-ion collisions in the very forward region (pseudorapidity n > 8.4). The main aim of LHCf is to provide precise measurements of the particles produced in high-energy p-p and p-Pb collisions in order to tune hadronic interaction models used by ground-based cosmic rays experiments. In this paper we will discuss the present status of the LHCf experiment, the collected data and measurements done, as well as future prospects.

DOI： 10.1393/ncc/i2017-17013-x