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Precision Measurement of the Decay Σ
Ablikim, M; Achasov, M N; Adlarson, P; Aliberti, R; Amoroso, A; An, M R; An, Q; Bai, Y; Bakina, O; Balossino, I; Ban, Y; Batozskaya, V; Begzsuren, K; Berger, N; Bertani, M; Bettoni, D; Bianchi, F; Bianco, E; Bloms, J; Bortone, A; Boyko, I; Briere, R A; Brueggemann, A; Cai, H; Cai, X; Calcaterra, A; Cao, G F; Cao, N; Cetin, S A; Chang, J F; Chang, T T; Chang, W L; Che, G R; Chelkov, G; Chen, C; Chen, Chao; Chen, G; Chen, H S; Chen, M L; Chen, S J; Chen, S M; Chen, T; Chen, X R; Chen, X T; Chen, Y B; Chen, Y Q; Chen, Z J; Cheng, W S; Choi, S K; Chu, X.
Afiliação
  • Ablikim M; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Achasov MN; G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia.
  • Adlarson P; Uppsala University, Box 516, SE-75120 Uppsala, Sweden.
  • Aliberti R; Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
  • Amoroso A; University of Turin, I-10125 Turin, Italy.
  • An MR; INFN, I-10125 Turin, Italy.
  • An Q; Liaoning Normal University, Dalian 116029, People's Republic of China.
  • Bai Y; State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People's Republic of China.
  • Bakina O; University of Science and Technology of China, Hefei 230026, People's Republic of China.
  • Balossino I; Southeast University, Nanjing 211100, People's Republic of China.
  • Ban Y; Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia.
  • Batozskaya V; INFN Sezione di Ferrara, I-44122 Ferrara, Italy.
  • Begzsuren K; Peking University, Beijing 100871, People's Republic of China.
  • Berger N; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Bertani M; National Centre for Nuclear Research, Warsaw 02-093, Poland.
  • Bettoni D; Institute of Physics and Technology, Peace Avenue 54B, Ulaanbaatar 13330, Mongolia.
  • Bianchi F; Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
  • Bianco E; INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
  • Bloms J; INFN Sezione di Ferrara, I-44122 Ferrara, Italy.
  • Bortone A; University of Turin, I-10125 Turin, Italy.
  • Boyko I; INFN, I-10125 Turin, Italy.
  • Briere RA; University of Turin, I-10125 Turin, Italy.
  • Brueggemann A; INFN, I-10125 Turin, Italy.
  • Cai H; University of Muenster, Wilhelm-Klemm-Strasse 9, 48149 Muenster, Germany.
  • Cai X; University of Turin, I-10125 Turin, Italy.
  • Calcaterra A; INFN, I-10125 Turin, Italy.
  • Cao GF; Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia.
  • Cao N; Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
  • Cetin SA; University of Muenster, Wilhelm-Klemm-Strasse 9, 48149 Muenster, Germany.
  • Chang JF; Wuhan University, Wuhan 430072, People's Republic of China.
  • Chang TT; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chang WL; State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People's Republic of China.
  • Che GR; INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
  • Chelkov G; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chen C; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
  • Chen C; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chen G; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
  • Chen HS; Turkish Accelerator Center Particle Factory Group, Istinye University, 34010 Istanbul, Turkey.
  • Chen ML; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chen SJ; State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People's Republic of China.
  • Chen SM; Xinyang Normal University, Xinyang 464000, People's Republic of China.
  • Chen T; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chen XR; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
  • Chen XT; Nankai University, Tianjin 300071, People's Republic of China.
  • Chen YB; Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia.
  • Chen YQ; Nankai University, Tianjin 300071, People's Republic of China.
  • Chen ZJ; Soochow University, Suzhou 215006, People's Republic of China.
  • Cheng WS; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Choi SK; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chu X; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
Phys Rev Lett ; 130(21): 211901, 2023 May 26.
Article em En | MEDLINE | ID: mdl-37295102
ABSTRACT
Using (10 087±44)×10^{6} J/ψ events collected with the BESIII detector, the radiative hyperon decay Σ^{+}→pγ is studied at an electron-positron collider experiment for the first time. The absolute branching fraction is measured to be (0.996±0.021_{stat}±0.018_{syst})×10^{-3}, which is lower than its world average value by 4.2 standard deviations. Its decay asymmetry parameter is determined to be -0.652±0.056_{stat}±0.020_{syst}. The branching fraction and decay asymmetry parameter are the most precise to date, and the accuracies are improved by 78% and 34%, respectively.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2023 Tipo de documento: Article
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2023 Tipo de documento: Article