E-resources
Peer reviewed
-
Achasov, M N; An, Q; Batozskaya, V; Bortone, A; Boyko, I; Briere, R A; Cao, G F; Cetin, S A; Chen, C; Chen, G; Chen, S M; Chen, X T; Chu, X; Cibinetto, G; Cossio, F; Ding, X X; Du, S X; Fang, J; Fang, W X; Feldbauer, F; Fu, C D; Gong, L; Gramigna, S; Greco, M; Guo, A Q; Guo, R P; Guo, Y P; Guskov, A; He, K L; Hou, Z L; Hu, T; Hu, Y; Hussain, T; Jing, M Q; K, X; Kavatsyuk, M; Kühn, W; Li, C; Li, G; Li, H B; Li, Hui; Liang, H; Liao, G R; Liao, L Z; Liu, Fang; Liu, H M; Liu, L C; Liu, Y; Liu, Z Q; Ma, M M; Maas, F E; Maggiora, M; Malde, S; Nikolaev, I B; Ping, J L; Qi, F Z; Qian, S; Qin, L Q; Redmer, C F; Rodin, V; Rolo, M; Shao, M; Shen, H F; Shi, J Y; Su, Y J; Sun, G X; Sun, J F; Wang, B; Wang, D Y; Wang, F; Wang, K; Wang, T; Wang, X; Wang, Y; Wang, Y D; Wang, Y Q; Wang, Z Y; Wang, Ziyi; Wenzel, C W; Wollenberg, L; Wu, Y J; Xiang, T; Yang, H X; Yu, C X; Yuan, L; Yuan, S C; Yuan, Y; Yuan, Z Y; Zhai, X Y; Zhang, D H; Zhang, H Y; Zhang, X Y; Zhang, X Y; Zhang, Y H; Zheng, J P; Zhong, X; Zhu, K J; Zhu, L; Zhu, L X; Zhu, Y C
Physical review letters, 05/2023, Volume: 130, Issue: 21Journal Article
Using (10 087±44)×10^{6} J/ψ events collected with the BESIII detector, the radiative hyperon decay Σ^{+}→pγ is studied at an electron-positron collider experiment for the first time. The absolute branching fraction is measured to be (0.996±0.021_{stat}±0.018_{syst})×10^{-3}, which is lower than its world average value by 4.2 standard deviations. Its decay asymmetry parameter is determined to be -0.652±0.056_{stat}±0.020_{syst}. The branching fraction and decay asymmetry parameter are the most precise to date, and the accuracies are improved by 78% and 34%, respectively.
