Authors
M Ablikim, M N Achasov, P Adlarson, X C Ai, R Aliberti, A Amoroso, Q An, Y Bai, O Bakina, Y Ban, H-R Bao, V Batozskaya, K Begzsuren, N Berger, M Berlowski, M B Bertani, D Bettoni, F Bianchi, E Bianco, A Bortone, I Boyko, R A Briere, A Brueggemann, H Cai, M H Cai, X Cai, A Calcaterra, G F Cao, N Cao, S A Cetin, X Y Chai, J F Chang, T T Chang, G R Che, Y Z Che, C H Chen, Chao Chen, G Chen, H S Chen, H Y Chen, M L Chen, S J Chen, S M Chen, T Chen, X R Chen, X T Chen, X Y Chen, Y B Chen, Y Q Chen, Z K Chen, J C Cheng, L N Cheng, S K Choi, X Chu, G Cibinetto, F Cossio, J Cottee-Meldrum, H L Dai, J P Dai, X C Dai, A Dbeyssi, R E de Boer, D Dedovich, C Q Deng, Z Y Deng, A Denig, I Denisenko, M Destefanis, F De Mori, X X Ding, Y Ding, Y X Ding, J Dong, L Y Dong, M Y Dong, X Dong, M C Du, S X Du, S X Du, X L Du, Y Y Duan, Z H Duan, P Egorov, G F Fan, J J Fan, Y H Fan, J Fang, J Fang, S S Fang, W X Fang, Y Q Fang, L Fava, F Feldbauer, G Felici, C Q Feng, J H Feng, L Feng, Q X Feng, Y T Feng, M Fritsch, C D Fu, J L Fu, Y W Fu, H Gao, Y Gao, Y N Gao, Y N Gao, Y Y Gao, Z Gao, S Garbolino, I Garzia, L Ge, P T Ge, Z W Ge, C Geng, E M Gersabeck, A Gilman, K Goetzen, J D Gong, L Gong, W X Gong, W Gradl, S Gramigna, M Greco, M D Gu, M H Gu, C Y Guan, A Q Guo, J N Guo, L B Guo, M J Guo, R P Guo, X Guo, Y P Guo, A Guskov, J Gutierrez, T T Han, F Hanisch, K D Hao, X Q Hao, F A Harris, C Z He, K L He, F H Heinsius, C H Heinz, Y K Heng, C Herold, P C Hong, G Y Hou, X T Hou, Y R Hou, Z L Hou, H M Hu, J F Hu, Q P Hu, S L Hu, T Hu, Y Hu, Z M Hu, G S Huang, K X Huang, L Q Huang, P Huang, X T Huang, Y P Huang, Y S Huang, T Hussain, N Hüsken, N In der Wiesche, J Jackson, Q Ji, Q P Ji, W Ji, X B Ji, X L Ji, X Q Jia, Z K Jia, D Jiang, H B Jiang, P C Jiang, S J Jiang, X S Jiang, Y Jiang, J B Jiao, J K Jiao, Z Jiao, S Jin, Y Jin, M Q Jing, X M Jing, T Johansson, S Kabana, N Kalantar-Nayestanaki, X L Kang, X S Kang, M Kavatsyuk, B C Ke, V Khachatryan, A Khoukaz, O B Kolcu, B Kopf, L Kröger, M Kuessner, X Kui, N Kumar, A Kupsc, W Kühn, Q Lan, W N Lan, T T Lei, M Lellmann, T Lenz, C Li, C Li, C H Li, C K Li, D M Li, F Li, G Li, H B Li, H J Li, H L Li, H N Li, Hui Li, J R Li, J S Li, J W Li, K Li, K L Li, L J Li, Lei Li, M H Li, M R Li, P L Li, P R Li, Q M Li, Q X Li, R Li, S X Li, Shanshan Li, T Li, T Y Li, W D Li, W G Li, X Li, X H Li, X K Li, X L Li, X Y Li, X Z Li, Y Li, Y G Li, Y P Li, Z H Li, Z J Li, Z X Li, Z Y Li, C Liang, H Liang, Y F Liang, Y T Liang, G R Liao, L B Liao, M H Liao, Y P Liao, J Libby, A Limphirat, D X Lin, L Q Lin, T Lin, B J Liu, B X Liu, C X Liu, F Liu, F H Liu, Feng Liu, G M Liu, H Liu, H B Liu, H H Liu, H M Liu, Huihui Liu, J B Liu, J J Liu, K Liu, K Liu, K Y Liu, Ke Liu, L Liu, Liang Liu, L C Liu, Lu Liu, M H Liu, P L Liu, Q Liu, S B Liu, W M Liu, W T Liu, X Liu, X K Liu, X L Liu, X Y Liu, Y Liu, Y Liu, Y B Liu, Z A Liu, Z D Liu, Z Q Liu, Z Y Liu, X C Lou, H J Lu, J G Lu, X L Lu, Y Lu, Y H Lu, Y P Lu, Z H Lu, C L Luo, J R Luo, J S Luo, M X Luo, T Luo, X L Luo, Z Y Lv, X R Lyu, Y F Lyu, Y H Lyu, F C Ma, H L Ma, Heng Ma, J L Ma, L L Ma, L R Ma, Q M Ma, R Q Ma, R Y Ma, T Ma, X T Ma, X Y Ma, Y M Ma, F E Maas, I MacKay, M Maggiora, S Malde, Q A Malik, H X Mao, Y J Mao, Z P Mao, S Marcello, A Marshall, F M Melendi, Y H Meng, Z X Meng, G Mezzadri, H Miao, T J Min, R E Mitchell, X H Mo, B Moses, N Yu Muchnoi, J Muskalla, Y Nefedov, F Nerling, H Neuwirth, Z Ning, S Nisar, Q L Niu, W D Niu, Y Niu, C Normand, S L Olsen, Q Ouyang, S Pacetti, X Pan, Y Pan, A Pathak, Y P Pei, M Pelizaeus, H P Peng, X J Peng, Y Y Peng, K Peters, K Petridis, J L Ping, R G Ping, S Plura, V Prasad, F Z Qi, H R Qi, M Qi, S Qian, W B Qian, C F Qiao, J H Qiao, J J Qin, J L Qin, L Q Qin, L Y Qin, P B Qin, X P Qin, X S Qin, Z H Qin, J F Qiu, Z H Qu, J Rademacker, C F Redmer, A Rivetti, M Rolo, G Rong, S S Rong, F Rosini, Ch Rosner, M Q Ruan, N Salone, A Sarantsev, Y Schelhaas, K Schoenning, M Scodeggio, W Shan, X Y Shan, Z J Shang, J F Shangguan, L G Shao, M Shao, C P Shen, H F Shen, W H Shen, X Y Shen, B A Shi, H Shi, J L Shi, J Y Shi, S Y Shi, X Shi, H L Song, J J Song, M H Song, T Z Song, W M Song, Y X Song, Zirong Song, S Sosio, S Spataro, S Stansilaus, F Stieler, S S Su, G B Sun, G X Sun, H Sun, H K Sun, J F Sun, K Sun, L Sun, R Sun, S S Sun, T Sun, W Y Sun, Y C Sun, Y H Sun, Y J Sun, Y Z Sun, Z Q Sun, Z T Sun, C J Tang, G Y Tang, J Tang, J J Tang, L F Tang, Y A Tang, L Y Tao, M Tat, J X Teng, J Y Tian, W H Tian, Y Tian, Z F Tian, I Uman, B Wang, B Wang, Bo Wang, C Wang, C Wang, Cong Wang, D Y Wang, H J Wang, J Wang, J J Wang, J P Wang, K Wang, L L Wang, L W Wang, M Wang, M Wang, N Y Wang, S Wang, Shun Wang, T Wang, T J Wang, W Wang, W P Wang, X Wang, X F Wang, X L Wang, X N Wang, Xin Wang, Y Wang, Y D Wang, Y F Wang, Y H Wang, Y J Wang, Y L Wang, Y N Wang, Y N Wang, Yaqian Wang, Yi Wang, Yuan Wang, Z Wang, Z Wang, Z L Wang, Z Q Wang, Z Y Wang, Ziyi Wang, D Wei, D H Wei, H R Wei, F Weidner, S P Wen, U Wiedner, G Wilkinson, M Wolke, J F Wu, L H Wu, L J Wu, Lianjie Wu, S G Wu, S M Wu, X Wu, Y J Wu, Z Wu, L Xia, B H Xiang, D Xiao, G Y Xiao, H Xiao, Y L Xiao, Z J Xiao, C Xie, K J Xie, Y Xie, Y G Xie, Y H Xie, Z P Xie, T Y Xing, C J Xu, G F Xu, H Y Xu, M Xu, Q J Xu, Q N Xu, T D Xu, X P Xu, Y Xu, Y C Xu, Z S Xu, F Yan, L Yan, W B Yan, W C Yan, W H Yan, W P Yan, X Q Yan, H J Yang, H L Yang, H X Yang, J H Yang, R J Yang, Y Yang, Y H Yang, Y Q Yang, Y Z Yang, Z P Yao, M Ye, M H Ye, Z J Ye, Junhao Yin, Z Y You, B X Yu, C X Yu, G Yu, J S Yu, L W Yu, T Yu, X D Yu, Y C Yu, Y C Yu, C Z Yuan, H Yuan, J Yuan, J Yuan, L Yuan, M K Yuan, S H Yuan, Y Yuan, C X Yue, Ying Yue, A A Zafar, F R Zeng, S H Zeng, X Zeng, Y J Zeng, Y J Zeng, Y C Zhai, Y H Zhan, S N Zhang, B L Zhang, B X Zhang, D H Zhang, G Y Zhang, G Y Zhang, H Zhang, H Zhang, H C Zhang, H H Zhang, H Q Zhang, H R Zhang, H Y Zhang, J Zhang, J J Zhang, J L Zhang, J Q Zhang, J S Zhang, J W Zhang, J X Zhang, J Y Zhang, J Z Zhang, Jianyu Zhang, L M Zhang, Lei Zhang, N Zhang, P Zhang, Q Zhang, Q Y Zhang, R Y Zhang, S H Zhang, Shulei Zhang, X M Zhang, X Y Zhang, Y Zhang, Y Zhang, Y T Zhang, Y H Zhang, Y P Zhang, Z D Zhang, Z H Zhang, Z L Zhang, Z L Zhang, Z X Zhang, Z Y Zhang, Z Y Zhang, Z Z Zhang, Zh Zh Zhang, G Zhao, J Y Zhao, J Z Zhao, L Zhao, L Zhao, M G Zhao, S J Zhao, Y B Zhao, Y L Zhao, Y X Zhao, Z G Zhao, A Zhemchugov, B Zheng, B M Zheng, J P Zheng, W J Zheng, X R Zheng, Y H Zheng, B Zhong, C Zhong, H Zhou, J Q Zhou, S Zhou, X Zhou, X K Zhou, X R Zhou, X Y Zhou, Y X Zhou, Y Z Zhou, A N Zhu, J Zhu, K Zhu, K J Zhu, K S Zhu, L Zhu, L X Zhu, S H Zhu, T J Zhu, W D Zhu, W J Zhu, W Z Zhu, Y C Zhu, Z A Zhu, X Y Zhuang, J H Zou, J Zu, BESIII Collaboration
Published in
Physical review letters. Volume 136. Issue 25. Pages 251802. Jun 26, 2026.
Abstract
Using (10 087±44)×10^{6} J/ψ events collected with the BESIII detector, a full angular analysis is carried out on the process J/ψ→ΛΛ[over ¯]→nπ^{0}p[over ¯]π^{+}+c.c. The decay parameters α_{0} for Λ→nπ^{0} and α[over ¯]_{0} for Λ[over ¯]→n[over ¯]π^{0} are measured to be 0.668±0.007±0.002 and -0.677±0.007±0.003, respectively, yielding the most precise test for CP symmetry of neutral decays of Λ, A_{CP}^{0}=(α_{0}+α[over ¯]_{0})/(α_{0}-α[over ¯]_{0}), to be -0.006±0.007±0.002. The ratios α_{0}/α_{-} and α[over ¯]_{0}/α_{+} are determined to be 0.884±0.013±0.006 and 0.885±0.013±0.004, where α_{-} and α_{+} are the decay parameters of Λ→pπ^{-} and Λ[over ¯]→p[over ¯]π^{+}, respectively. The ratios, found to be smaller than unity by more than 5σ, confirm the presence of the ΔI=3/2 transition in the Λ and Λ[over ¯] decays, which is expected to improve the theoretical calculations for isospin amplitudes, and A_{CP}, in hyperon decays. In all results, the first and second uncertainties are statistical and systematic, respectively.
PMID:
42430625
Bibliographic data and abstract were imported from PubMed on 11 Jul 2026.
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