論文 - 居波　賢二

Measurement of B → K*(892)γ decays at Belle II 査読有り 国際共著 国際誌 Open Access

Adachi I., Aggarwal L., Ahmed H., Aihara H., Akopov N., Aloisio A., Althubiti N., Anh Ky N., Asner D.M., Atmacan H., Aushev T., Aushev V., Aversano M., Ayad R., Babu V., Bae H., Baghel N.K., Bahinipati S., Bambade P., Banerjee S., Bansal S., Barrett M., Bartl M., Baudot J., Baur A., Beaubien A., Becherer F., Becker J., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhardwaj V., Bhuyan B., Bianchi F., Bierwirth L., Bilka T., Biswas D., Bobrov A., Bodrov D., Bolz A., Bondar A., Borah J., Boschetti A., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campagna Q., Campajola M., Cao L., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Chang P., Cheaib R., Cheema P., Chen C., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cochran J., Corona L., Cui J.X., Dattola F., De La Cruz-Burelo E., De La Motte S.A., de Marino G., De Nardo G., De Pietro G., de Sangro R., Destefanis M., Dey S., Dhamija R., Di Canto A., Di Capua F., Dingfelder J., Doležal Z., Domínguez Jiménez I., Dong T.V., Dorigo M., Dort K., Dossett D., Dubey S., Dugic K., Dujany G., Ecker P., Eliachevitch M.

Journal of High Energy Physics   2025 巻 ( 9 )   2025年9月

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記述言語：英語   出版者・発行元：Journal of High Energy Physics  

We present measurements of B → K^*(892)γ decays using 365 fb⁻¹ of data collected from 2019 to 2022 by the Belle II experiment at the SuperKEKB asymmetric-energy e⁺e⁻ collider. The data sample contains (387 ± 6) × 10⁶ Υ(4S) events. We measure branching fractions () and CP asymmetries () for both B⁰→ K^*0γ and B⁺→ K^*+γ decays. The difference in CP asymmetries () and the isospin asymmetry (∆<inf>0+</inf>) between these neutral and charged channels are also measured. We obtain the following branching fractions and CP asymmetries:,,, and. The measured difference in CP asymmetries is, and the measured isospin asymmetry is ∆<inf>0+</inf> = (+4.8 ± 2.0 ± 1.8)%. The first uncertainties listed are statistical and the second are systematic. These results are consistent with world-average values and theory predictions.

DOI： 10.1007/JHEP09(2025)024

Open Access

Scopus

Test of lepton flavor universality with measurements of RðD + Þ and RðD* + Þ using semileptonic B tagging at the Belle II experiment Open Access

Adachi I., Adamczyk K., Aggarwal L., Ahmed H., Aihara H., Akopov N., Alghamdi S., Alhakami M., Aloisio A., Althubiti N., Amos K., Angelsmark M., Anh Ky N., Antonioli C., Asner D.M., Atmacan H., Aushev T., Aushev V., Aversano M., Ayad R., Babu V., Bae H., Baghel N.K., Bahinipati S., Bambade P., Banerjee S., Bansal S., Barrett M., Bartl M., Baudot J., Beaubien A., Becherer F., Becker J., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhardwaj V., Bhuyan B., Bianchi F., Bilka T., Biswas D., Bobrov A., Bodrov D., Bolz A., Bondar A., Borah J., Boschetti A., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campagna Q., Campajola M., Cao L., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Chang P., Cheaib R., Cheema P., Cheon B.G., Chilikin K., Chin J., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cochran J., Consigny I., Corona L., Cui J.X., De La Cruz-Burelo E., De La Motte S.A., De Nardo G., De Pietro G., de Sangro R., Destefanis M., Dey S., Dhamija R., Di Capua F., Dingfelder J., Doležal Z., Jiménez I.D., Dong T.V., Dorigo M., Dossett D., Dubey S., Dugic K., Dujany G., Ecker P.

Physical Review D   112 巻 ( 3 )   2025年8月

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出版者・発行元：Physical Review D  

We report measurements of the ratios of branching fractions (Formula presented), where (Formula presented) denotes either an electron or a muon. These ratios test the universality of the charged-current weak interaction. The results are based on a 365 fb⁻¹ data sample collected with the Belle II detector at the SuperKEKB e^þe⁻ collider, which operates at a center-of-mass energy corresponding to the (Formula presented) resonance, just above the threshold for BB̄ production. Signal candidates are reconstructed by selecting events in which the companion B meson from the (Formula presented) decay is identified in semileptonic modes. The τ lepton is reconstructed via its leptonic decays. We obtain (Formula presented) and (Formula presented), which are consistent with world average values. Accounting for the correlation between them, these values differ from the Standard Model expectation by a collective significance of 1.7 standard deviations.

DOI： 10.1103/fmn3-h8fy

Open Access

Scopus

Measurement of the CP asymmetry in D+ → π+π0 decays at Belle II Open Access

Adachi I., Aggarwal L., Ahmed H., Aihara H., Akopov N., Alghamdi S., Alhakami M., Aloisio A., Amos K., Angelsmark M., Anh Ky N., Antonioli C., Asner D.M., Atmacan H., Aushev V., Aversano M., Ayad R., Babu V., Bae H., Baghel N.K., Bambade P., Banerjee S., Bansal S., Barrett M., Bartl M., Baudot J., Baur A., Beaubien A., Becherer F., Becker J., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhardwaj V., Bhuyan B., Bianchi F., Biswas D., Bobrov A., Bodrov D., Bondar A., Bonvicini G., Borah J., Boschetti A., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campagna Q., Campajola M., Cao L., Casarosa G., Cecchi C., Chang M.C., Cheema P., Chen L., Cheon B.G., Chilikin K., Chin J., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Consigny I., Corona L., Cui J.X., Das S., De La Cruz-Burelo E., A. De La Motte S., De Pietro G., de Sangro R., Destefanis M., Di Canto A., Doležal Z., Jiménez I.D., Dong T.V., Dong X., Dorigo M., Dugic K., Dujany G., Ecker P., Epifanov D., Eppelt J., Farkas R., Feichtinger P., Ferber T., Fillinger T., Finck C., Finocchiaro G., Forti F., Frey A., Fulsom B.G.

Physical Review D   112 巻 ( 3 ) 頁： 1 - 10   2025年8月

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出版者・発行元：Physical Review D  

We measure the CP asymmetry in D⁺ → π⁺π⁰ decays reconstructed in e⁺e⁻ collisions at the Belle II experiment using a dataset corresponding to an integrated luminosity of 428 fb⁻¹. A control sample of (Formula Presented) decays is used to correct for detection and production asymmetries. The result A<inf>CP</inf>(D⁺ → π⁺π⁰) = (−1.8 ± 0.9 ± 0.1)%, where the first uncertainty is statistical and the second systematic, is the most precise determination to date. It agrees with the prediction of CP symmetry from the standard model and with results of previous measurements.

DOI： 10.1103/3kqk-ldm4

Open Access

Scopus

Development of a picosecond-timing Cherenkov detector using gaseous photomultiplification

Okubo R., Matsuoka K., Iijima T., Inami K., Horii Y., Suzuki K., Sumi K., Ichikawa T., Ueda K., Koji S., Kondo A., Chiba K.

Journal of Instrumentation   20 巻 ( 8 )   2025年8月

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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  

Photosensitive gaseous detectors with a simple photoelectron multiplication mechanism consisting of resistive plate chambers are expected to offer both large photo coverage and excellent time resolution while keeping costs low. We have developed a gaseous photomultiplier (GasPM) with a single-photon timing resolution is 25 ± 1.1 ps and a gain of 3.3 × 10⁶, using a LaB<inf>6</inf> photocathode which has an extremely low quantum efficiency. We then developed a Cherenkov detector using GasPM with a CsI photocathode aiming for an application in time-of-flight measurements with a resolution below 10 ps for particle identification. We performed a test using the 3 GeV electron beam at the PF-AR test beamline located at KEK, Japan. As a result, the resolution of time-of-flight between the detector and a micro-channel-plate PMT, which has σ = 30 ps single photon time resolution, is measured to be σ = 73.0 ± 2.4 ps. The obtained resolution is worse than the target because of the lower gap voltage compared to the design. However, it is consistent with the expectation from the applied gap voltage. It is an important milestone toward our target resolution, which will be achieved by increasing the gap electric field and the number of photoelectrons in future development.

DOI： 10.1088/1748-0221/20/08/C08017

Scopus

Search for lepton-flavor-violating tau decays to ℓα at Belle 査読有り 国際共著 国際誌 Open Access

Uno K., Hayasaka K., Inami K., Aihara H., Ayad R., Banerjee S., Belous K., Bennett J., Bessner M., Biswas D., Bodrov D., Bračko M., Branchini P., Browder T.E., Budano A., Campajola M., Cho K., Choi S.K., Choi Y., Choudhury S., De Nardo G., De Pietro G., Di Capua F., Dingfelder J., Doležal Z., Ecker P., Epifanov D., Ferber T., Fulsom B.G., Gaur V., Giri A., Goldenzweig P., Graziani E., Guan Y., Gudkova K., Hadjivasiliou C., Hara T., Hayashii H., Herrmann D., Hsu C.L., Ipsita N., Ishikawa A., Itoh R., Iwasaki M., Jacobs W.W., Jin Y., Kiesling C., Kim C.H., Kim D.Y., Kim K.H., Kinoshita K., Kodyš P., Korobov A., Korpar S., Kovalenko E., Krokovny P., Kumar R., Kumara K., Kuzmin A., Kwon Y.J., Lam T., Li L.K., Li Y.B., Gioi L.L., Libby J., Liventsev D., Ma Y., Masuda M., Matsuda T., Matvienko D., Meier F., Merola M., Miyabayashi K., Mohanty G.B., Nakao M., Nakazawa H., Natochii A., Niiyama M., Nishida S., Ogawa S., Ono H., Pardi S., Park J., Park S.H., Patra S., Paul S., Pedlar T.K., Piilonen L.E., Podobnik T., Prell S., Prencipe E., Prim M.T., Russo G., Sandilya S., Santelj L., Savinov V., Schnell G., Schwanda C., Seino Y., Senyo K.

Journal of High Energy Physics   2025 巻 ( 8 )   2025年8月

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担当区分：筆頭著者   記述言語：英語   出版者・発行元：Journal of High Energy Physics  

We report a search for the lepton-flavor-violating decays τ^± → ℓ^±α (ℓ = e, μ), where α is an undetected spin-0 particle, such as an axion-like particle using 736 × 10⁶ tau lepton pairs collected by the Belle detector at the KEKB asymmetric-energy e⁺e⁻ collider. We find no evidence of signal and obtain the most stringent upper limits on the branching fractions at 95% confidence level: (τ^± → e^±α) < (0.4–6.4) × 10⁻⁴ and (τ^± → μ^±α) < (0.2–3.5) × 10⁻⁴ at 95% confidence level for an α mass in the range 0.0 ≤ m<inf>α</inf> ≤ 1.6 GeV/c².

DOI： 10.1007/JHEP08(2025)155

Open Access

Scopus

Search for lepton-flavor-violating τ− → ℓ−K0 decays at Belle and Belle II 査読有り 国際共著 国際誌 Open Access

Adachi I., Aggarwal L., Ahmed H., Ahn Y., Aihara H., Akopov N., Alghamdi S., Alhakami M., Aloisio A., Althubiti N., Amos K., Angelsmark M., Anh Ky N., Antonioli C., Asner D.M., Atmacan H., Aushev V., Aversano M., Ayad R., Babu V., Baghel N.K., Bahinipati S., Bambade P., Banerjee S., Barrett M., Bartl M., Baudot J., Baur A., Beaubien A., Becherer F., Becker J., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhuyan B., Bianchi F., Biswas D., Bobrov A., Bodrov D., Bondar A., Bonvicini G., Boschetti A., Bozek A., Bračko M., Branchini P., Browder T.E., Budano A., Bussino S., Campagna Q., Campajola M., Cao L., Casarosa G., Cecchi C., Chang M.C., Cheaib R., Cheema P., Cheon B.G., Chilikin K., Chin J., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cochran J., Consigny I., Corona L., Cui J.X., De La Cruz-Burelo E., De La Motte S.A., de Marino G., De Nardo G., De Pietro G., de Sangro R., Destefanis M., Dey S., Di Canto A., Dingfelder J., Doležal Z., Domínguez Jiménez I., Dong T.V., Dorigo M., Dugic K., Dujany G., Ecker P., Epifanov D., Eppelt J., Feichtinger P., Ferber T., Fillinger T., Finck C., Finocchiaro G., Fodor A., Forti F., Fulsom B.G.

Journal of High Energy Physics   2025 巻 ( 8 )   2025年8月

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記述言語：英語   出版者・発行元：Journal of High Energy Physics  

We present the results of a search for charged-lepton-flavor violating decays, where ℓ⁻ is either an electron or a muon. We combine e⁺e⁻ data samples recorded by the Belle II experiment at the SuperKEKB collider (428 fb⁻¹) with samples recorded by the Belle experiment at the KEKB collider (980 fb⁻¹) to obtain a sample of 1.3 billion e⁺e⁻ → τ⁺τ⁻ events. We observe 0 and 1 events and set 90% confidence level upper limits of 0.8 × 10⁻⁸ and 1.2 × 10⁻⁸ on the branching fractions of the decay modes and, respectively. These are the most stringent upper limits to date.

DOI： 10.1007/JHEP08(2025)092

Open Access

Scopus

Search for lepton flavor-violating decay modes B0→ K*0τ±ℓ∓ (ℓ = e, μ) with hadronic B-tagging at Belle and Belle II 査読有り 国際共著 国際誌 Open Access

Adachi I., Ahn Y., Aihara H., Akopov N., Alghamdi S., Alhakami M., Aloisio A., Amos K., Angelsmark M., Anh Ky N., Antonioli C., Asner D.M., Atmacan H., Aushev V., Aversano M., Ayad R., Babu V., Bae H., Baghel N.K., Bahinipati S., Bambade P., Banerjee S., Bansal S., Barrett M., Baudot J., Baur A., Beaubien A., Becherer F., Becker J., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhuyan B., Bianchi F., Bilka T., Biswas D., Bobrov A., Bodrov D., Borah J., Boschetti A., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campajola M., Cao L., Casarosa G., Cecchi C., Chang M.C., Cheema P., Cheon B.G., Chilikin K., Chin J., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Consigny I., Corona L., Cui J.X., De La Cruz-Burelo E., De La Motte S.A., de Marino G., De Pietro G., de Sangro R., Destefanis M., Di Canto A., Dingfelder J., Doležal Z., Domínguez Jiménez I., Dong T.V., Dong X., Dorigo M., Dujany G., Ecker P., Epifanov D., Farkas R., Feichtinger P., Ferber T., Fillinger T., Finck C., Finocchiaro G., Forti F., Frey A., Fulsom B.G., Gale A., Ganiev E., Garcia-Hernandez M., Garg R., Gaudino G., Gaur V., Gautam V.

Journal of High Energy Physics   2025 巻 ( 8 )   2025年8月

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記述言語：英語   出版者・発行元：Journal of High Energy Physics  

We present the results of a search for the charged-lepton-flavor violating decays B⁰ → K^*0τ^±ℓ^∓, where ℓ^∓ is either an electron or a muon. The results are based on 365 fb⁻¹ and 711 fb⁻¹ datasets collected with the Belle II and Belle detectors, respectively. We use an exclusive hadronic B-tagging technique, and search for a signal decay in the system recoiling against a fully reconstructed B meson. We find no evidence for B⁰ → K^*0τ^±ℓ^∓ decays and set upper limits on the branching fractions in the range of (2.9–6.4)×10⁻⁵ at 90% confidence level.

DOI： 10.1007/JHEP08(2025)184

Open Access

Scopus

Search for Lepton-Flavor-Violating Decay Modes B^{0}→K_{S}^{0}τ^{±}ℓ^{∓} with Hadronic B Tagging at Belle and Belle II 国際共著 Open Access

Adachi I., Adamczyk K., Aggarwal L., Ahmed H., Aihara H., Akopov N., Alhakami M., Aloisio A., Althubiti N., Ky N.A., Asner D.M., Atmacan H., Aushev V., Aversano M., Ayad R., Babu V., Bae H., Baghel N.K., Bahinipati S., Bambade P., Banerjee S., Bansal S., Barrett M., Bartl M., Baudot J., Baur A., Beaubien A., Becherer F., Becker J., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhardwaj V., Bhuyan B., Bianchi F., Biswas D., Bobrov A., Bodrov D., Bolz A., Boschetti A., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campagna Q., Campajola M., Cao L., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Chang P., Cheaib R., Cheema P., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cochran J., Corona L., Cui J.X., De La Cruz-Burelo E., De La Motte S.A., de Marino G., De Nardo G., De Pietro G., de Sangro R., Destefanis M., Dey S., Dhamija R., Di Canto A., Di Capua F., Dingfelder J., Doležal Z., Jiménez I.D., Dong T.V., Dong X., Dorigo M., Dossett D., Dubey S., Dugic K., Dujany G., Ecker P., Feichtinger P., Ferber T., Fillinger T., Finck C., Finocchiaro G., Fodor A.

Physical Review Letters   135 巻 ( 4 )   2025年7月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

We present the first search for the lepton-flavor-violating decay modes B^{0}→K_{S}^{0}τ^{±}ℓ^{∓} (ℓ=μ,e) using the 711 and 365  fb^{-1} data samples recorded by the Belle and Belle II detectors, respectively. We use a hadronic B-tagging technique to fully reconstruct a B meson and search for signal decays in the system recoiling against the tagged meson, considering τ decays to either light leptons, one charged hadron, or one charged hadron and a neutral pion. We find no evidence for B^{0}→K_{S}^{0}τ^{±}ℓ^{∓} decays and set 90% confidence level upper limits on the branching fractions in the range of [0.8,3.6]×10^{-5}.

DOI： 10.1103/yzvh-v3hm

Open Access

Scopus

Search for P_{cc[over ¯]s}(4459)^{0} and P_{cc[over ¯]s}(4338)^{0} in ϒ(1S,2S) Inclusive Decays at Belle 国際共著 Open Access

Adachi I., Aggarwal L., Ahmed H., Ahn J.K., Aihara H., Akopov N., Alhakami M., Aloisio A., Althubiti N., Asner D.M., Atmacan H., Aushev V., Aversano M., Ayad R., Babu V., Bae H., Baghel N.K., Bahinipati S., Bambade P., Banerjee S., Bansal S., Barrett M., Bartl M., Baudot J., Baur A., Beaubien A., Becherer F., Becker J., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhardwaj V., Bhuyan B., Bianchi F., Biswas D., Bodrov D., Bolz A., Boschetti A., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campagna Q., Campajola M., Cao L., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Chang P., Cheaib R., Cheema P., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cochran J., Corona L., Cui J.X., De La Cruz-Burelo E., De La Motte S.A., De Nardo G., De Pietro G., de Sangro R., Destefanis M., Dey S., Dhamija R., Di Capua F., Dingfelder J., Doležal Z., Domínguez Jiménez I., Dong T.V., Dong X., Dossett D., Dugic K., Dujany G., Ecker P., Eppelt J., Feichtinger P., Ferber T., Fillinger T., Finck C., Finocchiaro G., Forti F., Fulsom B.G., Gabrielli A., Ganiev E., Garcia-Hernandez M., Gaudino G.

Physical Review Letters   135 巻 ( 4 )   2025年7月

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

Using data samples of 102 million ϒ(1S) events and 158 million ϒ(2S) events collected by the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider, we search for [udscc[over ¯]] pentaquark states decaying to J/ψΛ. Using the first observations of ϒ(1S,2S) inclusive decays to J/ψΛ, we find evidence of the P_{cc[over ¯]s}(4459)^{0} state with a local significance of 3.3 standard deviations, including statistical and systematic uncertainties. We measure the mass and width of the P_{cc[over ¯]s}(4459)^{0} to be (4471.7±4.8±0.6)  MeV/c^{2} and (22±13±3)  MeV, respectively. The branching fractions for P_{cc[over ¯]s}(4459)^{0} production are measured to be B[ϒ(1S)→P_{cc[over ¯]s}(4459)^{0}/P[over ¯]_{cc[over ¯]s}(4459)^{0}+anything]=(3.5±2.0±0.2)×10^{-6} and B[ϒ(2S)→P_{cc[over ¯]s}(4459)^{0}/P[over ¯]_{cc[over ¯]s}(4459)^{0}+anything]=(2.9±1.7±0.4)×10^{-6}. The inclusive branching fractions of ϒ(1S,2S)→J/ψΛ/Λ[over ¯] are measured to be B[ϒ(1S)→J/ψΛ/Λ[over ¯]+anything]=(36.9±5.3±2.4)×10^{-6} and B[ϒ(2S)→J/ψΛ/Λ[over ¯]+anything]=(22.3±5.7±3.1)×10^{-6}. We measure the visible cross section σ(e^{+}e^{-}→J/ψΛ/Λ[over ¯]+anything)=(90±14±6)  fb for the continuum production at sqrt[s]=10.52  GeV. In all cases, the first uncertainties are statistical and the second are systematic.

DOI： 10.1103/pf8m-6j69

Open Access

Scopus

Measurement of the time-integrated CP asymmetry in D0 → K0SK0S decays using opposite-side flavor tagging at Belle and Belle II Open Access

Adachi I., Ahn Y., Akopov N., Alghamdi S., Alhakami M., Aloisio A., Althubiti N., Amos K., Angelsmark M., AnhKy N., Antonioli C., Asner D.M., Atmacan H., Aushev T., Aversano M., Ayad R., Babu V., Bae H., Baghel N.K., Bahinipati S., Bambade P., Banerjee S., Barrett M., Bartl M., Baudot J., Baur A., Beaubien A., Becherer F., Becker J., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhuyan B., Bianchi F., Bilka T., Biswas D., Bobrov A., Bodrov D., Bondar A., Borah J., Boschetti A., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campajola M., Cao L., Casarosa G., Cecchi C., Cheema P., Cheon B.G., Chilikin K., Chin J., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Consigny I., Corona L., Cui J.X., DeLaCruz-Burelo E., DeLaMotte S.A., deMarino G., DePietro G., deSangro R., Destefanis M., DiCanto A., Dingfelder J., Doležal Z., DomínguezJiménez I., Dong T.V., Dorigo M., Dujany G., Ecker P., Epifanov D., Farkas R., Feichtinger P., Ferber T., Fillinger T., Finck C., Finocchiaro G., Fodor A., Forti F., Fulsom B.G., Gabrielli A., Gale A., Ganiev E., Garcia-Hernandez M., Garg R., Gaudino G., Gaur V.

Physical Review D   112 巻 ( 1 )   2025年7月

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出版者・発行元：Physical Review D  

We measure the time-integrated CP asymmetry in D⁰ → K⁰<inf>S</inf>K⁰<inf>S</inf> decays reconstructed in e⁺e^- → c¯c events collected by the Belle and Belle II experiments. The corresponding data samples have integrated luminosities of 980 and 428 fb^-1, respectively. To infer the flavor of the D⁰ meson, we exploit the correlation between the flavor of the reconstructed decay and the electric charges of particles reconstructed in the rest of the e⁺e⁻ → c¯c event. This results in a sample which is independent from any other previously used at Belle or Belle II. The result, A<inf>CP</inf>(D⁰ → K⁰ <inf>S</inf>K⁰<inf>S</inf>) =(1.3 ± 2.0 ± 0.2)%, where the first uncertainty is statistical and the second systematic, is consistent with previous determinations and with CP symmetry.

DOI： 10.1103/8x1h-39dp

Open Access

Scopus

Measurement of the time-integrated CP asymmetry in D0 → π0π0 decays at Belle II Open Access

Adachi I., Ahn Y., Akopov N., Alghamdi S., Alhakami M., Aloisio A., Althubiti N., Amos K., Angelsmark M., Anh Ky N., Antonioli C., Asner D.M., Atmacan H., Aushev T., Aversano M., Ayad R., Babu V., Bae H., Baghel N.K., Bahinipati S., Bambade P., Banerjee S., Barrett M., Bartl M., Baudot J., Baur A., Beaubien A., Becherer F., Becker J., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhuyan B., Bianchi F., Bilka T., Biswas D., Bobrov A., Bodrov D., Bondar A., Borah J., Boschetti A., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campajola M., Cao L., Casarosa G., Cecchi C., Cheema P., Cheon B.G., Chilikin K., Chin J., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Consigny I., Corona L., Cui J.X., De La Cruz-Burelo E., De La Motte S.A., De Pietro G., de Sangro R., Destefanis M., Di Canto A., Dingfelder J., Doležal Z., Domínguez Jiménez I., Dong T.V., Dorigo M., Dujany G., Ecker P., Epifanov D., Eppelt J., Farkas R., Feichtinger P., Ferber T., Fillinger T., Finck C., Finocchiaro G., Fodor A., Forti F., Fulsom B.G., Gabrielli A., Gale A., Ganiev E., Garcia-Hernandez M., Garg R., Gaudino G., Gaur V.

Physical Review D   112 巻 ( 1 ) 頁： 1 - 12   2025年7月

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出版者・発行元：Physical Review D  

We measure the time-integrated CP asymmetry, A<inf>CP</inf>, in D⁰ → π⁰π⁰ decays reconstructed in e⁺e⁻ → cc̄ events collected by Belle II during 2019–2022. The data corresponds to an integrated luminosity of 428 fb⁻¹. The D⁰ decays are required to originate from the flavor-conserving D^*+ → D⁰π⁺ decay to determine the charm flavor at production time. Control samples of D⁰ → K⁻π⁺ decays, with or without an associated pion from a D^*+ decay, are used to correct for detection asymmetries. The result, A<inf>CP</inf>(D⁰ → π⁰π⁰) = (0.30 ± 0.72 ± 0.20)%, where the first uncertainty is statistical and the second systematic, is consistent with CP symmetry.

DOI： 10.1103/vg9c-xvdc

Open Access

Scopus

Acceleration of Positive Muons by a Radio-Frequency Cavity

Aritome, S; Futatsukawa, K; Hara, H; Hayasaka, K; Ibaraki, Y; Ichikawa, T; Iijima, T; Iinuma, H; Ikedo, Y; Imai, Y; Inami, K; Ishida, K; Kamal, S; Kamioka, S; Kawamura, N; Kimura, M; Koda, A; Koji, S; Kojima, K; Kondo, A; Kondo, Y; Kuzuba, M; Matsushita, R; Mibe, T; Miyamoto, Y; Nakamura, JG; Nakazawa, Y; Ogawa, S; Okazaki, Y; Olin, A; Otani, M; Oyama, S; Saito, N; Sato, H; Sato, T; Sato, Y; Shimomura, K; Shioya, Z; Strasser, P; Sugiyama, S; Sumi, K; Suzuki, K; Takeuchi, Y; Tanida, M; Tojo, J; Ueda, K; Uetake, S; Xie, XH; Yamada, M; Yamamoto, S; Yamazaki, T; Yamura, K; Yoshida, M; Yoshioka, T; Yotsuzuka, M

PHYSICAL REVIEW LETTERS   134 巻 ( 24 )   2025年6月

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出版者・発行元：Physical Review Letters  

Acceleration of positive muons from thermal energy to 100 keV has been demonstrated. Thermal muons were generated by resonant multiphoton ionization of muonium atoms emitted from a sheet of laser-ablated aerogel. The thermal muons were first electrostatically accelerated to 5.7 keV, followed by further acceleration to 100 keV using a radio-frequency quadrupole with an intensity of 2×10-3 μ+/pulse. The transverse normalized rms emittance of the accelerated muons in the horizontal and vertical planes were 0.85±0.25(stat)-0.13+0.22(syst) πmm mrad and 0.32±0.03(stat)-0.02+0.05(syst) πmm mrad, respectively. The measured emittance values demonstrated phase-space reduction by a factor of 2.0×102 (horizontal) and 4.1×102 (vertical) allowing good acceleration efficiency. These results pave the way to realize the first-ever muon accelerator for a variety of applications in particle physics, material science, and other fields.

DOI： 10.1103/PhysRevLett.134.245001

Web of Science

Scopus

PubMed

Measurement of the branching fraction, polarization, and time-dependent CP asymmetry in B0 →ρ+ρ- decays and constraint on the CKM angle φ2

Adachi I., Aggarwal L., Ahmed H., Akopov N., Alhakami M., Aloisio A., Althubiti N., Anh Ky N., Asner D.M., Atmacan H., Aushev V., Aversano M., Ayad R., Babu V., Baghel N.K., Bambade P., Banerjee S., Barrett M., Bartl M., Baudot J., Baur A., Beaubien A., Becker J., Bennett J.V., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhuyan B., Biswas D., Bobrov A., Bodrov D., Bolz A., Bondar A., Borah J., Boschetti A., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campagna Q., Campajola M., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Chang P., Cheaib R., Cheema P., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cochran J., Corona L., Cui J.X., De La Cruz-Burelo E., De La Motte S.A., De Nardo G., De Pietro G., De Sangro R., Destefanis M., Dey S., Di Capua F., Dingfelder J., DoleŽal Z., Domínguez Jiménez I., Dong T.V., Dong X., Dorigo M., Dossett D., Dugic K., Dujany G., Ecker P., Eppelt J., Feichtinger P., Ferber T., Fillinger T., Finck C., Finocchiaro G., Fodor A., Forti F., Fulsom B.G., Gabrielli A., Ganiev E., Garcia-Hernandez M., Garg R., Gaudino G., Gaur V., Gaz A., Gellrich A., Ghevondyan G.

Physical Review D   111 巻 ( 9 )   2025年5月

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出版者・発行元：Physical Review D  

We present a measurement of the branching fraction and fraction of longitudinal polarization of B0→ρ+ρ- decays, which have two π0's in the final state. We also measure time-dependent CP violation parameters for decays into longitudinally polarized ρ+ρ- pairs. This analysis is based on a data sample containing (387±6)×106 ϒ(4S) mesons collected with the Belle II detector at the SuperKEKB asymmetric-energy e+e- collider in 2019-2022. We obtain B(B0→ρ+ρ-)=(2.89-0.22+0.23 -0.27+0.29)×10-5, fL=0.921-0.025+0.024 -0.015+0.017, S=-0.26±0.19±0.08, and C=-0.02±0.12-0.05+0.06, where the first uncertainties are statistical and the second are systematic. We use these results to perform an isospin analysis to constrain the Cabibbo-Kobayashi-Maskawa angle φ2 and obtain two solutions; the result consistent with other Standard Model constraints is φ2=(92.6-4.7+4.5)°.

DOI： 10.1103/PhysRevD.111.092001

Scopus

Measurement of the ratio of partial branching fractions of inclusive B ¯ →xuℓ ν ¯ to B ¯ →xcℓ ν ¯ and the ratio of their spectra with hadronic tagging

Hohmann M., Urquijo P., Adachi I., Aihara H., Asner D.M., Aushev T., Ayad R., Babu V., Banerjee S., Bauer M., Bennett J., Bernlochner F., Bessner M., Bhuyan B., Bilka T., Biswas D., Bobrov A., Bodrov D., Bonvicini G., Borah J., Bozek A., Bračko M., Branchini P., Browder T.E., Budano A., Campajola M., Cao L., Chang M.C., Cheon B.G., Cho K., Choi S.K., Choi Y., Das S., Dash N., De Nardo G., De Pietro G., Dhamija R., Dingfelder J., DoleŽal Z., Dong T.V., Dubey S., Ecker P., Ferber T., Ferlewicz D., Frey A., Fulsom B.G., Gaur V., Giri A., Goldenzweig P., Graziani E., Gu T., Gudkova K., Hadjivasiliou C., Hartbrich O., Hayasaka K., Hayashii H., Hazra S., Hedges M.T., Herrmann D., Hou W.S., Hsu C.L., Inami K., Ishikawa A., Itoh R., Iwasaki M., Jacobs W.W., Ji Q.P., Jia S., Jin Y., Kawasaki T., Kiesling C., Kim D.Y., Kim K.H., Kim Y.K., Kinoshita K., Korobov A., Kovalenko E., KriŽan P., Kuhr T., Kumar M., Kumar R., Kumara K., Kwon Y.J., Lam T., Laurenza M., Lee S.C., Levit D., Lewis P., Li L.K., Li Gioi L., Liventsev D., Masuda M., Matsuda T., Matvienko D., Maurya S.K., Meier F., Merola M., Metzner F., Miyabayashi K., Mizuk R.

Physical Review D   111 巻 ( 9 )   2025年5月

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出版者・発行元：Physical Review D  

We present a measurement of the ratio of partial branching fractions of the semileptonic inclusive decays, B¯→Xuℓν¯ to B¯→Xcℓν¯, where ℓ=(e,μ), using the full Belle sample of 772×106 BB¯ pairs collected at the ϒ(4S) resonance. The identification of inclusive B¯→Xuℓν¯ decays is difficult due to the abundance of Cabibbo-Kobayashi-Maskawa-favored B¯→Xcℓν¯ events, which share a similar event topology. To minimize dependence on the modeling of these channels, a data-driven description of B¯→Xcℓν¯ is employed. The ratio is measured via a two-dimensional fit to the squared four-momentum transfer to the lepton pair, and the charged lepton energy in the B meson rest frame, where the latter must be larger than 1 GeV, covering approximately 86% and 78% of the B¯→Xuℓν¯ and B¯→Xcℓν¯ phase space, respectively. We find ΔB(B¯→Xuℓν¯)/ΔB(B¯→Xcℓν¯)=(1.99±0.17stat±0.16syst)×10-2, where the uncertainties are statistical and systematic, respectively. We extract |Vub|/|Vcb| using two theoretical calculations for the partial decay rate of B¯→Xuℓν¯, finding (|Vub|/|Vcb|)BLNP=(9.81±0.42stat±0.38syst±0.51ΔΓ(B¯→Xuℓν¯)±0.20ΔΓ(B¯→Xcℓν¯))×10-2 and (|Vub|/|Vcb|)GGOU=(10.06±0.43stat±0.39syst±0.23ΔΓ(B¯→Xuℓν¯)±0.20ΔΓ(B¯→Xcℓν¯))×10-2, where the third and fourth uncertainties are from the partial decay rates of B¯→Xuℓν¯ and B¯→Xcℓν¯, respectively. In addition, we report the partial branching fractions separately for charged and neutral B meson decays, and for electron and muon decay channels. We place a limit on isospin breaking in B¯→Xuℓν¯ decays, and find no indication of lepton flavor universality violation in either the charmed or charmless mode. Furthermore, we unfold the B¯→Xuℓν¯ and B¯→Xcℓν¯ yields and report the differential ratio in lepton energy and four-momentum transfer squared.

DOI： 10.1103/PhysRevD.111.092016

Scopus

Measurement of branching fractions, CP asymmetry, and isospin asymmetry for B →ργ decays using Belle and Belle II data

Adachi I., Adamczyk K., Aggarwal L., Aihara H., Akopov N., Aloisio A., Anh Ky N., Asner D.M., Atmacan H., Aushev T., Aushev V., Aversano M., Ayad R., Babu V., Bae H., Bahinipati S., Bambade P., Banerjee S., Bansal S., Barrett M., Baudot J., Baur A., Beaubien A., Becherer F., Becker J., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhuyan B., Bianchi F., Bierwirth L., Bilka T., Bilokin S., Biswas D., Bobrov A., Bodrov D., Bolz A., Bondar A., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campajola M., Cao L., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Chang P., Cheaib R., Cheema P., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Choi S.K., Choudhury S., Corona L., Das S., Dattola F., De La Cruz-Burelo E., De La Motte S.A., De Nardo G., De Nuccio M., De Pietro G., De Sangro R., Destefanis M., Dhamija R., Di Canto A., Di Capua F., Dingfelder J., DoleŽal Z., Dong T.V., Dorigo M., Dort K., Dossett D., Dreyer S., Dubey S., Dujany G., Ecker P., Eliachevitch M., Epifanov D., Feichtinger P., Ferber T., Ferlewicz D., Fillinger T., Finck C., Finocchiaro G., Fodor A., Forti F., Frey A., Fulsom B.G.

Physical Review D   111 巻 ( 7 )   2025年4月

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出版者・発行元：Physical Review D  

We present measurements of B+→ρ+γ and B0→ρ0γ decays using a combined data sample of 772×106 BB¯ pairs collected by the Belle experiment and 387×106 BB¯ pairs collected by the Belle II experiment in e+e- collisions at the ϒ(4S) resonance. After an optimized selection, a simultaneous fit to the Belle and Belle II datasets yields 114±12 B+→ρ+γ and 99±12 B0→ρ0γ decays. The measured branching fractions are (13.1-1.9-1.2+2.0+1.3)×10-7 and (7.6±1.3-0.8+1.0)×10-7 for B+→ρ+γ and B0→ρ0γ decays, respectively, where the first uncertainty is statistical and the second is systematic. We also measure the isospin asymmetry AI(B→ργ)=(10.9-11.7-7.3+11.2+7.8)% and the direct CP asymmetry ACP(B+→ρ+γ)=(-8.2±15.2-1.3+2.0)%.

DOI： 10.1103/PhysRevD.111.L071103

Scopus

Measurement of the branching fraction and CP -violating asymmetry of the decay B0 →π0π0 using 387 million ϒ (4S) decays in Belle II data

Adachi I., Aggarwal L., Ahmed H., Aihara H., Alhakami M., Aloisio A., Althubiti N., Anh Ky N., Asner D.M., Atmacan H., Aushev V., Aversano M., Ayad R., Babu V., Bae H., Baghel N.K., Bahinipati S., Bambade P., Banerjee S., Bansal S., Barrett M., Bartl M., Baudot J., Baur A., Beaubien A., Becherer F., Becker J., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhardwaj V., Bhuyan B., Bianchi F., Bilka T., Biswas D., Bobrov A., Bodrov D., Bolz A., Bondar A., Borah J., Boschetti A., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campagna Q., Campajola M., Cao L., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Chang P., Cheaib R., Cheema P., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cochran J., Corona L., Cui J.X., De La Cruz-Burelo E., De La Motte S.A., De Marino G., De Nardo G., De Pietro G., De Sangro R., Destefanis M., Dey S., Dhamija R., Di Canto A., Di Capua F., Dingfelder J., DoleŽal Z., Domínguez Jiménez I., Dong T.V., Dong X., Dorigo M., Dossett D., Dubey S., Dugic K., Dujany G., Ecker P., Epifanov D., Eppelt J., Feichtinger P., Ferber T., Fillinger T.

Physical Review D   111 巻 ( 7 )   2025年4月

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出版者・発行元：Physical Review D  

We measure the branching fraction and CP-violating flavor-dependent rate asymmetry of B0→π0π0 decays reconstructed using the Belle II detector in an electron-positron collision sample containing 387×106 ϒ(4S) mesons. Using an optimized event selection, we find 125±20 signal decays in a fit to background-discriminating and flavor-sensitive distributions. The resulting branching fraction is (1.25±0.23)×10-6 and the CP-violating asymmetry is 0.03±0.30.

DOI： 10.1103/PhysRevD.111.L071102

Scopus

Measurement of the inclusive branching fractions for decays into D mesons via hadronic tagging 査読有り 国際共著 国際誌 Open Access

Adachi I., Aggarwal L., Ahmed H., Aihara H., Akopov N., Aloisio A., Al Said S., Althubiti N., Anh Ky N., Asner D.M., Atmacan H., Aushev T., Aushev V., Aversano M., Ayad R., Babu V., Bae H., Baghel N.K., Bahinipati S., Bambade P., Banerjee S., Bansal S., Barrett M., Bartl M., Baudot J., Baur A., Beaubien A., Becherer F., Becker J., Belous K., Bennett J.V., Bernlochner F.U., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhardwaj V., Bhuyan B., Bianchi F., Bierwirth L., Bilka T., Biswas D., Bobrov A., Bodrov D., Bolz A., Bondar A., Borah J., Boschetti A., Bozek A., Bračko M., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campagna Q., Campajola M., Cao L., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Chang P., Cheaib R., Cheema P., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cochran J., Corona L., Cui J.X., Dattola F., De La Cruz-Burelo E., De La Motte S.A., De Nardo G., De Nuccio M., De Pietro G., de Sangro R., Destefanis M., Dey S., Dhamija R., Di Canto A., Di Capua F., Dingfelder J., Doležal Z., Domínguez Jiménez I., Dong T.V., Dorner D., Dort K., Dossett D., Dreyer S., Dubey S., Dugic K., Dujany G.

Journal of High Energy Physics   2025 巻 ( 4 )   2025年4月

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記述言語：英語   出版者・発行元：Journal of High Energy Physics  

We report measurements of the absolute branching fractions,, and, where the latter is measured for the first time. The results are based on a 121.4 fb⁻¹ data sample collected at the Υ(10860) resonance by the Belle detector at the KEKB asymmetric-energy e⁺e⁻ collider. We reconstruct one meson in events and measure yields of, D⁰, and D⁺ mesons in the rest of the event. We obtain,, and, where the first uncertainty is statistical and the second is systematic. Averaging with previous Belle measurements gives and. For the production fraction at the Υ(10860), we find.

DOI： 10.1007/JHEP04(2025)114

Open Access

Scopus

Production cross sections of light and charmed mesons in e+e- annihilation near 10.58 GeV

Seidl R., Adachi I., Aihara H., Aushev T., Ayad R., Banerjee S., Belous K., Bennett J., Bessner M., Bhuyan B., Biswas D., Bodrov D., Bračko M., Branchini P., Browder T.E., Budano A., Campajola M., Chilikin K., Cho K., Choi S.K., Choi Y., Choudhury S., Das S., De Nardo G., De Pietro G., Di Capua F., Dingfelder J., DoleŽal Z., Dong T.V., Dossett D., Ecker P., Ferber T., Fulsom B.G., Gaur V., Giri A., Goldenzweig P., Graziani E., Guan Y., Gudkova K., Hadjivasiliou C., Hara T., Hayashii H., Herrmann D., Hou W.S., Hsu C.L., Inami K., Ipsita N., Ishikawa A., Itoh R., Iwasaki M., Jacobs W.W., Jia S., Jin Y., Joo K.K., Kaliyar A.B., Kiesling C., Kim C.H., Kim D.Y., Kim K.H., Kodyš P., Korobov A., Korpar S., KriŽan P., Krokovny P., Kumar D., Kumara K., Kwon Y.J., Lam T., Li L.K., Li Y.B., Li Gioi L., Libby J., Liventsev D., Ma Y., Masuda M., Matsuda T., Matvienko D., Merola M., Miyabayashi K., Mussa R., Nakao M., Natochii A., Niiyama M., Nishida S., Ogawa S., Ono H., Pakhlova G., Pardi S., Park J., Park S.H., Passeri A., Patra S., Paul S., Pedlar T.K., Pestotnik R., Piilonen L.E., Podobnik T., Prencipe E., Prim M.T., Russo G.

Physical Review D   111 巻 ( 5 )   2025年3月

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

We report measurements of production cross sections for ρ+, ρ0, ω, K∗+, K∗0, φ, η, KS0, f0(980), D+, D0, Ds+, D∗+, D∗0, and Ds∗+ in e+e- collisions at a center-of-mass energy near 10.58 GeV. The data were recorded by the Belle experiment, consisting of 571 fb-1 at 10.58 GeV and 74 fb-1 at 10.52 GeV. Production cross sections are extracted as a function of the fractional hadron momentum xp. The measurements are compared to pythia Monte Carlo generator predictions with various fragmentation settings, including those that have increased fragmentation into vector mesons over pseudoscalar mesons. The cross sections measured for light hadrons are consistent with no additional increase of vector over pseudoscalar mesons. The charmed-meson cross sections are compared to earlier measurements - when available - including older Belle results, which they supersede. They are in agreement before application of an improved initial-state radiation correction procedure that causes slight changes in their xp shapes.

DOI： 10.1103/physrevd.111.052003

Scopus

その他リンク： http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevD.111.052003/fulltext

Observations of the singly Cabibbo-suppressed decays Ξc+→pKS0, Ξc+→Λπ+, and Ξc+→Σ0π+ at Belle and Belle II Open Access

Adachi I., Aggarwal L., Akopov N., Alhakami M., Aloisio A., Althubiti N., Anh Ky N., Asner D.M., Atmacan H., Aushev T., Aushev V., Aversano M., Ayad R., Babu V., Baghel N.K., Bahinipati S., Bambade P., Banerjee S., Barrett M., Baudot J., Baur A., Beaubien A., Becker J., Bennett J.V., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhuyan B., Bianchi F., Biswas D., Bobrov A., Bodrov D., Bolz A., Bondar A., Borah J., Boschetti A., Bozek A., Branchini P., Briere R.A., Browder T.E., Budano A., Bussino S., Campagna Q., Campajola M., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Cheaib R., Cheema P., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Corona L., Cui J.X., De La Cruz-Burelo E., De La Motte S.A., De Nardo G., De Pietro G., de Sangro R., Destefanis M., Dey S., Di Canto A., Di Capua F., Dingfelder J., Doležal Z., Domínguez Jiménez I., Dong T.V., Dorigo M., Dossett D., Dugic K., Dujany G., Ecker P., Epifanov D., Feichtinger P., Ferber T., Fillinger T., Finocchiaro G., Forti F., Fulsom B.G., Gabrielli A., Garcia-Hernandez M., Gaudino G., Gaur V., Gaz A., Gellrich A., Ghevondyan G., Ghosh D., Ghumaryan H., Giakoustidis G., Giordano R., Giri A., Gironella Gironell P., Gobbo B.

Journal of High Energy Physics   2025 巻 ( 3 )   2025年3月

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

Using data samples of 983.0 fb⁻¹ and 427.9 fb⁻¹ accumulated with the Belle and Belle II detectors operating at the KEKB and SuperKEKB asymmetric-energy e⁺e⁻ colliders, singly Cabibbo-suppressed decays Ξc+→pKS0, Ξc+→Λπ+, and Ξc+→Σ0π+ are observed for the first time. The ratios of branching fractions of Ξc+→pKS0, Ξc+→Λπ+, and Ξc+→Σ0π+ relative to that of Ξc+→Ξ−π+π+ are measured to be (Formula presented.) Multiplying these values by the branching fraction of the normalization channel, BΞc+→Ξ−π+π+=2.9±1.3%, the absolute branching fractions are determined to be (Formula presented.) The first and second uncertainties above are statistical and systematic, respectively, while the third ones arise from the uncertainty in BΞc+→Ξ−π+π+.

DOI： 10.1007/jhep03(2025)061

Open Access

Scopus

その他リンク： https://link.springer.com/article/10.1007/JHEP03(2025)061/fulltext.html

Observation of the decay B0 →j/ψω at Belle II 査読有り 国際共著

Adachi I., Aggarwal L., Ahmed H., Aihara H., Akopov N., Alhakami M., Aloisio A., Althubiti N., Anh Ky N., Asner D.M., Atmacan H., Aushev V., Aversano M., Ayad R., Babu V., Baghel N.K., Bahinipati S., Bambade P., Banerjee S., Barrett M., Baudot J., Baur A., Beaubien A., Becker J., Bennett J.V., Bertacchi V., Bertemes M., Bertholet E., Bessner M., Bettarini S., Bhuyan B., Bianchi F., Biswas D., Bobrov A., Bodrov D., Bolz A., Bondar A., Borah J., Boschetti A., Bozek A., Bračko M., Branchini P., Brenny N., Briere R.A., Browder T.E., Budano A., Bussino S., Campagna Q., Campajola M., Casarosa G., Cecchi C., Cerasoli J., Chang M.C., Cheaib R., Cheema P., Chen C., Cheon B.G., Chilikin K., Chirapatpimol K., Cho H.E., Cho K., Cho S.J., Choi S.K., Choudhury S., Cochran J., Corona L., Cui J.X., De La Cruz-Burelo E., De La Motte S.A., De Marino G., De Nardo G., De Pietro G., De Sangro R., Destefanis M., Dey S., Di Canto A., Di Capua F., Dingfelder J., DoleŽal Z., Domínguez Jiménez I., Dong T.V., Dong X., Dorigo M., Dossett D., Dugic K., Dujany G., Ecker P., Epifanov D., Eppelt J., Feichtinger P., Ferber T., Fillinger T., Finck C., Finocchiaro G., Fodor A., Forti F., Fulsom B.G., Gabrielli A., Ganiev E., Garcia-Hernandez M.

Physical Review D   111 巻 ( 3 )   2025年2月

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記述言語：英語  

DOI： 10.1103/PhysRevD.111.032012

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