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Measurement of the Absolute Branching Fraction and Decay Asymmetry of Λ→nγ.
Ablikim, M; Achasov, M N; Adlarson, P; Albrecht, M; Aliberti, R; Amoroso, A; An, M R; An, Q; Bai, X H; Bai, Y; Bakina, O; Baldini Ferroli, R; Balossino, I; Ban, Y; Batozskaya, V; Becker, D; Begzsuren, K; Berger, N; Bertani, M; Bettoni, D; Bianchi, F; 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, W L; 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, Z J; Cheng, W S; Choi, S K; Chu, X.
Affiliation
  • 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.
  • Albrecht M; Bochum Ruhr-University, D-44780 Bochum, Germany.
  • Aliberti R; Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
  • Amoroso A; University of Turin and INFN, 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 XH; State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, People's Republic of China.
  • Bai Y; University of Science and Technology of China, Hefei 230026, People's Republic of China.
  • Bakina O; University of Jinan, Jinan 250022, People's Republic of China.
  • Baldini Ferroli R; Southeast University, Nanjing 211100, People's Republic of China.
  • Balossino I; Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  • Ban Y; INFN Laboratori Nazionali di Frascati, INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
  • Batozskaya V; INFN Sezione di Ferrara, INFN Sezione di Ferrara, I-44122 Ferrara, Italy.
  • Becker D; Peking University, Beijing 100871, People's Republic of China.
  • Begzsuren K; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Berger N; National Centre for Nuclear Research, Warsaw 02-093, Poland.
  • Bertani M; Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, D-55099 Mainz, Germany.
  • 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.
  • Bloms J; INFN Laboratori Nazionali di Frascati, INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
  • Bortone A; INFN Sezione di Ferrara, INFN Sezione di Ferrara, I-44122 Ferrara, Italy.
  • Boyko I; University of Turin and INFN, University of Turin, I-10125 Turin, Italy.
  • Briere RA; INFN, I-10125 Turin, Italy.
  • Brueggemann A; University of Muenster, Wilhelm-Klemm-Strasse 9, 48149 Muenster, Germany.
  • Cai H; University of Turin and INFN, University of Turin, I-10125 Turin, Italy.
  • Cai X; INFN, I-10125 Turin, Italy.
  • Calcaterra A; Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  • Cao GF; Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.
  • Cao N; University of Muenster, Wilhelm-Klemm-Strasse 9, 48149 Muenster, Germany.
  • Cetin SA; Wuhan University, Wuhan 430072, People's Republic of China.
  • Chang JF; 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.
  • Chelkov G; INFN Laboratori Nazionali di Frascati, INFN Laboratori Nazionali di Frascati, I-00044 Frascati, Italy.
  • Chen C; 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 G; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chen HS; University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China.
  • Chen ML; Turkish Accelerator Center Particle Factory Group, Istinye University, 34010 Istanbul, Turkey.
  • Chen SJ; Institute of High Energy Physics, Beijing 100049, People's Republic of China.
  • Chen SM; State Key Laboratory of Particle Detection and Electronics, Beijing 100049, Hefei 230026, 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; Joint Institute for Nuclear Research, 141980 Dubna, Moscow region, Russia.
  • Chen YB; 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 ; 129(21): 212002, 2022 Nov 18.
Article de En | MEDLINE | ID: mdl-36461970
ABSTRACT
The radiative hyperon decay Λ→nγ is studied using (10087±44)×10^{6} J/ψ events collected with the BESIII detector operating at BEPCII. The absolute branching fraction of the decay Λ→nγ is determined to be (0.832±0.038_{stat}±0.054_{syst})×10^{-3}, which is a factor of 2.1 lower and 5.6 standard deviations different than the previous measurement. By analyzing the joint angular distribution of the decay products, the first determination of the decay asymmetry α_{γ} is reported with a value of -0.16±0.10_{stat}±0.05_{syst}.
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Texte intégral: 1 Collection: 01-internacional Base de données: MEDLINE Langue: En Journal: Phys Rev Lett Année: 2022 Type de document: Article
Texte intégral
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PubMed Links
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Texte intégral: 1 Collection: 01-internacional Base de données: MEDLINE Langue: En Journal: Phys Rev Lett Année: 2022 Type de document: Article