兰州大学机构库
First Measurement of the Absolute Branching Fraction of Λ →pμ- ν ¯ μ
2021-09-17
Source PublicationPhysical Review Letters
ISSN0031-9007
Volume127Issue:12
AbstractThe absolute branching fraction of Λ→pμ-ν¯μ is reported for the first time based on an e+e- annihilation sample of 10×109 J/ψ events collected with the BESIII detector at s=3.097 GeV. The branching fraction is determined to be B(Λ→pμ-ν¯μ)=[1.48±0.21(stat)±0.08(syst)]×10-4, which is improved by about 30% in precision over the previous indirect measurements. Combining this result with the world average of B(Λ→pe-ν¯e), we obtain the ratio {[Γ(Λ→pμ-ν¯μ)]/[Γ(Λ→pe-ν¯e)]} to be 0.178±0.028, which agrees with the standard model prediction assuming lepton flavor universality. The asymmetry of the branching fractions of Λ→pμ-ν¯μ and Λ¯→p¯μ+νμ is also determined, and no evidence for CP violation is found. © 2021 authors. Published by the American Physical Society.
KeywordAbsolutebranchingfractions Branchingfractions CPviolations Indirectmeasurements Lepton flavor Measurementsof Modelprediction Thestandardmodel Timebased
PublisherAmerican Physical Society
DOI10.1103/PhysRevLett.127.121802
Indexed ByEI
Language英语
EI Accession Number20213910930982
EI Classification Number931.3 Atomic and Molecular Physics
Original Document TypeJournal article (JA)
Citation statistics
Document Type期刊论文
Identifierhttps://ir.lzu.edu.cn/handle/262010/469739
Collection兰州大学
Affiliation1.Institute of High Energy Physics, Beijing; 100049, China;
2.Beihang University, Beijing; 100191, China;
3.Beijing Institute of Petrochemical Technology, Beijing; 102617, China;
4.Bochum Ruhr-University, Bochum; D-44780, Germany;
5.Carnegie Mellon University, Pittsburgh; PA; 15213, United States;
6.Central China Normal University, Wuhan; 430079, China;
7.China Center of Advanced Science and Technology, Beijing; 100190, China;
8.COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road, Lahore; 54000, Pakistan;
9.Fudan University, Shanghai; 200443, China;
10.G. I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk; 630090, Russia;
11.GSI Helmholtzcentre for Heavy Ion Research GmbH, Darmstadt; D-64291, Germany;
12.Guangxi Normal University, Guilin; 541004, China;
13.Guangxi University, Nanning; 530004, China;
14.Hangzhou Normal University, Hangzhou; 310036, China;
15.Helmholtz Institute Mainz, Staudinger Weg 18, Mainz; D-55099, Germany;
16.Henan Normal University, Xinxiang; 453007, China;
17.Henan University of Science and Technology, Luoyang; 471003, China;
18.Huangshan College, Huangshan; 245000, China;
19.Hunan Normal University, Changsha; 410081, China;
20.Hunan University, Changsha; 410082, China;
21.Indian Institute of Technology Madras, Chennai; 600036, India;
22.Indiana University, Bloomington; IN; 47405, United States;
23.INFN Laboratori Nazionali di Frascati, Frascati; I-00044, Italy;
24.INFN Laboratori Nazionali di Frascati, INFN Sezione di Perugia, Perugia; I-06100, Italy;
25.INFN Laboratori Nazionali di Frascati, University of Perugia, Perugia; I-06100, Italy;
26.INFN Sezione di Ferrara, Ferrara; I-44122, Italy;
27.INFN Sezione di Ferrara, University of Ferrara, Ferrara; I-44122, Italy;
28.Institute of Modern Physics, Lanzhou; 730000, China;
29.Institute of Physics and Technology, Peace Avenue 54B, Ulaanbaatar; 13330, Mongolia;
30.Jilin University, Changchun; 130012, China;
31.Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, Mainz; D-55099, Germany;
32.Joint Institute for Nuclear Research, Moscow region, Dubna; 141980, Russia;
33.Justus-Liebig-Universitaet Giessen, II. Physikalisches Institut, Heinrich-Buff-Ring 16, Giessen; D-35392, Germany;
34.Lanzhou University, Lanzhou; 730000, China;
35.Liaoning Normal University, Dalian; 116029, China;
36.Liaoning University, Shenyang; 110036, China;
37.Nanjing Normal University, Nanjing; 210023, China;
38.Nanjing University, Nanjing; 210093, China;
39.Nankai University, Tianjin; 300071, China;
40.North China Electric Power University, Beijing; 102206, China;
41.Peking University, Beijing; 100871, China;
42.Qufu Normal University, Qufu; 273165, China;
43.Shandong Normal University, Jinan; 250014, China;
44.Shandong University, Jinan; 250100, China;
45.Shanghai Jiao Tong University, Shanghai; 200240, China;
46.Shanxi Normal University, Linfen; 041004, China;
47.Shanxi University, Taiyuan; 030006, China;
48.Sichuan University, Chengdu; 610064, China;
49.Soochow University, Suzhou; 215006, China;
50.South China Normal University, Guangzhou; 510006, China;
51.Southeast University, Nanjing; 211100, China;
52.State Key Laboratory of Particle Detection and Electronics, Beijing; 100049, China;
53.Sun Yat-Sen University, Guangzhou; 510275, China;
54.Suranaree University of Technology, University Avenue 111, Ratchasima, Nakhon; 30000, Thailand;
55.Tsinghua University, Beijing; 100084, China;
56.Turkish Accelerator Center Particle Factory Group, Istinye University, Istanbul; 34010, Turkey;
57.Near East University, North Cyprus, Mersin 10, Nicosia, Turkey;
58.University of Chinese Academy of Sciences, Beijing; 100049, China;
59.University of Groningen, Groningen; NL-9747 AA, Netherlands;
60.University of Hawaii, Honolulu; HI; 96822, United States;
61.University of Jinan, Jinan; 250022, China;
62.University of Manchester, Oxford Road, Manchester; M13 9PL, United Kingdom;
63.University of Minnesota, Minneapolis; MN; 55455, United States;
64.University of Muenster, Wilhelm-Klemm-Strasse 9, Muenster; 48149, Germany;
65.University of Oxford, Keble Road, Oxford; OX13RH, United Kingdom;
66.University of Science and Technology Liaoning, Anshan; 114051, China;
67.University of Science and Technology of China, Hefei; 230026, China;
68.University of South China, Hengyang; 421001, China;
69.University of the Punjab, Lahore; 54590, Pakistan;
70.University of Turin, Turin; I-10125, Italy;
71.University of Turin and INFN, University of Eastern Piedmont, Alessandria; I-15121, Italy;
72.University of Turin and INFN, INFN, Turin; I-10125, Italy;
73.Uppsala University, Box 516, Uppsala; SE-75120, Sweden;
74.Wuhan University, Wuhan; 430072, China;
75.Xinyang Normal University, Xinyang; 464000, China;
76.Zhejiang University, Hangzhou; 310027, China;
77.Zhengzhou University, Zhengzhou; 450001, China;
78.Moscow Institute of Physics and Technology, Moscow; 141700, Russia;
79.Novosibirsk State University, Novosibirsk; 630090, Russia;
80.NRC Kurchatov Institute, PNPI, Gatchina; 188300, Russia;
81.Goethe University Frankfurt, Frankfurt am Main; 60323, Germany;
82.Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education, Shanghai Key Laboratory for Particle Physics and Cosmology, Institute of Nuclear and Particle Physics, Shanghai; 200240, China;
83.Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai; 200443, China;
84.Harvard University, Department of Physics, Cambridge; MA; 02138, United States;
85.State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing; 100871, China;
86.School of Physics and Electronics, Hunan University, Changsha; 410082, China;
87.Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou; 510006, China;
88.Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou; 730000, China;
89.Lanzhou Center for Theoretical Physics, Lanzhou University, Lanzhou; 730000, China
Recommended Citation
GB/T 7714
Ablikim, M.,Achasov, M.N.,Adlarson, P.,et al. First Measurement of the Absolute Branching Fraction of Λ →pμ- ν ¯ μ[J]. Physical Review Letters,2021,127(12).
APA Ablikim, M..,Achasov, M.N..,Adlarson, P..,Ahmed, S..,Albrecht, M..,...&Lei, Z.H..(2021).First Measurement of the Absolute Branching Fraction of Λ →pμ- ν ¯ μ.Physical Review Letters,127(12).
MLA Ablikim, M.,et al."First Measurement of the Absolute Branching Fraction of Λ →pμ- ν ¯ μ".Physical Review Letters 127.12(2021).
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