Ablikim, MAchasov, M. N.Adlarson, PatrikAlbrecht, MalteAmoroso A.Çetin, Serkant AliKolcu, Onur Buğra2022-12-302022-12-302022Ablikim, 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., … BESIII Collaboration (2022). Measurement of the Absolute Branching Fraction and Decay Asymmetry of Λ→nγ. Physical review letters, 129(21), 212002. https://doi.org/10.1103/PhysRevLett.129.2120020031-9007http://dx.doi.org/10.1103/PhysRevLett.129.212002https://hdl.handle.net/20.500.12713/3803The radiative hyperon decay ??n? is studied using (10087±44)×10^{6} J/? events collected with the BESIII detector operating at BEPCII. The absolute branching fraction of the decay ??n? 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 ?_{?} is reported with a value of -0.16±0.10_{stat}±0.05_{syst}.eninfo:eu-repo/semantics/closedAccessArticle1292136461970WOS:0010229558000022-s2.0-85143370309Q110.1103/PhysRevLett.129.212002Q1