Abstract
The radiative hyperon decay Λ→nγ is studied using (10087±44)×106 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±0.038stat±0.054syst)×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 αγ is reported with a value of -0.16±0.10stat±0.05syst.
| Original language | English |
|---|---|
| Article number | 212002 |
| Journal | Physical Review Letters |
| Volume | 129 |
| Issue number | 21 |
| DOIs | |
| Publication status | Published - 18 Nov 2022 |
OECD FOS+WOS
- 1.03 PHYSICAL SCIENCES AND ASTRONOMY
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Measurement of the Absolute Branching Fraction and Decay Asymmetry of Λ →nγ. / BESIII Collaboration.
In: Physical Review Letters, Vol. 129, No. 21, 212002, 18.11.2022.Research output: Contribution to journal › Article › peer-review
TY - JOUR
T1 - Measurement of the Absolute Branching Fraction and Decay Asymmetry of Λ →nγ
AU - BESIII Collaboration
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Adlarson, P.
AU - Albrecht, M.
AU - Aliberti, R.
AU - Amoroso, A.
AU - An, M. R.
AU - An, Q.
AU - Bai, X. H.
AU - Bai, Y.
AU - Bakina, O.
AU - Baldini Ferroli, R.
AU - Balossino, I.
AU - Ban, Y.
AU - Batozskaya, V.
AU - Becker, D.
AU - Begzsuren, K.
AU - Berger, N.
AU - Bertani, M.
AU - Bettoni, D.
AU - Bianchi, F.
AU - Bloms, J.
AU - Bortone, A.
AU - Boyko, I.
AU - Briere, R. A.
AU - Brueggemann, A.
AU - Cai, H.
AU - Cai, X.
AU - Calcaterra, A.
AU - Cao, G. F.
AU - Cao, N.
AU - Cetin, S. A.
AU - Chang, J. F.
AU - Chang, W. L.
AU - Chelkov, G.
AU - Chen, C.
AU - Chen, Chao
AU - Chen, G.
AU - Chen, H. S.
AU - Chen, M. L.
AU - Chen, S. J.
AU - Chen, S. M.
AU - Chen, X. T.
AU - Chen, X. R.
AU - Chen, X. T.
AU - Chen, Y. B.
AU - Chen, Z. J.
AU - Cheng, W. S.
AU - Muchnoi, N. Yu
AU - Nikolaev, I. B.
N1 - Funding Information: The BESIII Collaboration thanks the staff of BEPCII and the IHEP computing center and the supercomputing center of USTC for their strong support. The authors benefit from informative comments from Prof. Li-Sheng Geng. This work is supported in part by the National Key R&D Program of China under Contracts No. 2020YFA0406400, No. 2020YFA0406300; National Natural Science Foundation of China (NSFC) under Contracts No. 11635010, No. 11735014, No. 11835012, No. 11935015, No. 11935016, No. 11935018, No. 11961141012, No. 12022510, No. 12025502, No. 12035009, No. 12035013, No. 12192260, No. 12192261, No. 12192262, No. 12192263, No. 12192264, No. 12192265, No. 11335008, No. 11625523, No. 11705192, No. 11950410506, No. 12061131003, No. 12105276, No. 12122509; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. U1832207, No. U1732263, No. U1832103, No. U2032111; CAS Key Research Program of Frontier Sciences under Contract No. QYZDJ-SSW-SLH040; 100 Talents Program of CAS; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; European Union’s Horizon 2020 research and innovation programme under Marie Sklodowska-Curie Grant Agreement under Contract No. 894790; German Research Foundation DFG under Contracts No. 443159800, Collaborative Research Center CRC 1044, GRK 2149; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; STFC (United Kingdom); The Royal Society, UK under Contracts No. DH140054, No. DH160214; Polish National Science Centre through the Grant No. 2019/35/O/ST2/02907; The Swedish Research Council; U.S. Department of Energy under Contract No. DE-FG02-05ER41374. Publisher Copyright: © 2022 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
PY - 2022/11/18
Y1 - 2022/11/18
N2 - The radiative hyperon decay Λ→nγ is studied using (10087±44)×106 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±0.038stat±0.054syst)×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 αγ is reported with a value of -0.16±0.10stat±0.05syst.
AB - The radiative hyperon decay Λ→nγ is studied using (10087±44)×106 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±0.038stat±0.054syst)×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 αγ is reported with a value of -0.16±0.10stat±0.05syst.
UR - http://www.scopus.com/inward/record.url?scp=85143370309&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.129.212002
DO - 10.1103/PhysRevLett.129.212002
M3 - Article
C2 - 36461970
AN - SCOPUS:85143370309
VL - 129
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 21
M1 - 212002
ER -