期刊
PHYSICAL REVIEW LETTERS
卷 129, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.129.212002
关键词
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资金
- National Key R&D Program of China [2020YFA0406400, 2020YFA0406300]
- National Natural Science Foundation of China (NSFC) [11635010, 11735014, 11835012, 11935015, 11935016, 11935018, 11961141012, 12022510, 12025502, 12035 009, 12035013, 12192260, 12192261, 12192262, 12192263, 12192264, 121922 65, 11335008, 11625523, 11705192, 11950410506, 12061131003, 12105276, 12122509]
- Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program
- NSFC [U1832207, U1732263, U1832103, U2032111]
- CAS [U1832207, U1732263, U1832103, U2032111]
- CAS Key Research Program of Frontier Sciences [QYZDJ-SSW-SLH040]
- 100 Talents Program of CAS
- Shanghai Key Laboratory for Particle Physics and Cosmology
- ERC [758462]
- European Union [894790]
- German Research Foundation DFG [443159800, CRC 1044, GRK 2149]
- Istituto Nazionale di Fisica Nucleare, Italy
- Ministry of Development of Turkey [DPT2006K-120470]
- National Science and Technology fund
- STFC (United Kingdom)
- Royal Society, UK [DH140054, DH160214]
- Polish National Science Centre [2019/35/O/ST2/02907]
- Swedish Research Council
- U.S. Department of Energy [DE-FG02-05ER41374]
- INPAC
The radiative hyperon decay Lambda -> n gamma was studied using the BESIII detector, and the absolute branching fraction and decay asymmetry were measured.
The radiative hyperon decay Lambda -> n gamma is studied using (10087 +/- 44) x 10(6) J/psi. events collected with the BESIII detector operating at BEPCII. The absolute branching fraction of the decay Lambda -> n gamma is determined to be (0.832 +/- 0.038(stat) +/- 0.054(syst)) x 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 a. is reported with a value of -0.16 +/- 0.10(stat) +/- 0.05(syst).
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