Σ^{+} and Σ[over ¯]^{-} Polarization in the J/ψ and ψ(3686) Decays.

M Ablikim,M N Achasov, P Adlarson,S Ahmed,M Albrecht,A Amoroso, Q An,Anita, Y Bai, O Bakina,R Baldini Ferroli,I Balossino, Y Ban,K Begzsuren,J V Bennett, N Berger,M Bertani,D Bettoni,F Bianchi,J Biernat, J Bloms,A Bortone, I Boyko, R A Briere, H Cai,X Cai,A Calcaterra,G F Cao,N Cao, S A Cetin,J F Chang,W L Chang, G Chelkov,D Y Chen,G Chen, H S Chen,M L Chen, S J Chen,X R Chen,Y B Chen,W Cheng,G Cibinetto,F Cossio,X F Cui, H L Dai, J P Dai,X C Dai, A Dbeyssi,R B de Boer, D Dedovich,Z Y Deng,A Denig, I Denysenko,M Destefanis,F De Mori, Y Ding, C Dong,J Dong,L Y Dong, M Y Dong, S X Du, J Fang, S S Fang,Y Fang, R Farinelli, L Fava, F Feldbauer,G Felici, C Q Feng,M Fritsch, C D Fu,Y Fu,X L Gao,Y Gao,Y G Gao, I Garzia, E M Gersabeck,A Gilman,K Goetzen,L Gong, W X Gong, W Gradl, M Greco,L M Gu, M H Gu,S Gu, Y T Gu, C Y Guan,A Q Guo, L B Guo, R P Guo, Y P Guo,A Guskov,S Han,T T Han,T Z Han, X Q Hao,F A Harris,K L He, F H Heinsius,T Held,Y K Heng,M Himmelreich,T Holtmann,Y R Hou, Z L Hou, H M Hu, J F Hu, T Hu, Y Hu,G S Huang,L Q Huang,X T Huang,Z Huang,N Huesken,T Hussain,W Ikegami Andersson,W Imoehl,M Irshad,S Jaeger,S Janchiv,Q Ji,Q P Ji,X B Ji,X L Ji,H B Jiang, X S Jiang,X Y Jiang, J B Jiao,Z Jiao,S Jin,Y Jin,T Johansson,N Kalantar-Nayestanaki,X S Kang,R Kappert,M Kavatsyuk, B C Ke, I K Keshk,A Khoukaz, P Kiese,R Kiuchi, R Kliemt,L Koch, O B Kolcu, B Kopf,M Kuemmel,M Kuessner,A Kupsc, M G Kurth,W Kühn, J J Lane, J S Lange, P Larin,L Lavezzi, H Leithoff,M Lellmann,T Lenz,C Li,C H Li,Cheng Li,D M Li,F Li,G Li,H B Li,H J Li,J L Li,J Q Li,Ke Li,L K Li,Lei Li,P L Li,P R Li,S Y Li,W D Li,W G Li,X H Li,X L Li,Z B Li,Z Y Li,H Liang,Y F Liang,Y T Liang, L Z Liao,J Libby, C X Lin, B Liu, B J Liu,C X Liu, D Liu, D Y Liu,F H Liu, Fang Liu, Feng Liu,H B Liu,H M Liu,Huanhuan Liu,Huihui Liu, J B Liu, J Y Liu,K Liu,K Y Liu,Ke Liu,L Liu,Q Liu,S B Liu,Shuai Liu,T Liu,X Liu, Y B Liu,Z A Liu,Z Q Liu, Y F Long, X C Lou,F X Lu, H J Lu, J D Lu, J G Lu,X L Lu,Y Lu,Y P Lu, C L Luo, M X Luo, P W Luo,T Luo, X L Luo, S Lusso, X R Lyu, F C Ma,H L Ma,L L Ma,M M Ma,Q M Ma,R Q Ma,R T Ma,X N Ma,X X Ma,X Y Ma,Y M Ma, F E Maas, M Maggiora,S Maldaner,S Malde, Q A Malik,A Mangoni, Y J Mao, Z P Mao,S Marcello,Z X Meng,J G Messchendorp, G Mezzadri, T J Min, R E Mitchell, X H Mo,Y J Mo,N Yu Muchnoi,H Muramatsu, S Nakhoul,Y Nefedov, F Nerling, I B Nikolaev, Z Ning,S Nisar,S L Olsen, Q Ouyang,S Pacetti,X Pan,Y Pan,A Pathak,P Patteri,M Pelizaeus, H P Peng,K Peters,J Pettersson, J L Ping, R G Ping, A Pitka,R Poling,V Prasad,H Qi,H R Qi, M Qi,T Y Qi,S Qian,W-B Qian,Z Qian, C F Qiao, L Q Qin,X P Qin,X S Qin, Z H Qin, J F Qiu,S Q Qu, K H Rashid,K Ravindran, C F Redmer, A Rivetti,V Rodin,M Rolo, G Rong,Ch Rosner,M Rump, A Sarantsev,M Savrié,Y Schelhaas, C Schnier,K Schoenning,D C Shan, W Shan,X Y Shan,M Shao, C P Shen, P X Shen, X Y Shen,H C Shi,R S Shi, X Shi, X D Shi,J J Song, Q Q Song, W M Song,Y X Song, S Sosio, S Spataro, F F Sui, G X Sun,J F Sun,L Sun,S S Sun,T Sun,W Y Sun,Y J Sun,Y K Sun,Y Z Sun,Z T Sun,Y H Tan,Y X Tan,C J Tang, G Y Tang,J Tang,V Thoren, B Tsednee, I Uman,B Wang, B L Wang,C W Wang, D Y Wang,H P Wang,K Wang, L L Wang,M Wang,M Z Wang,Meng Wang,W H Wang,W P Wang, X Wang, X F Wang, X L Wang,Y Wang, Y D Wang,Y F Wang, Y Q Wang,Z Wang,Z Y Wang,Ziyi Wang,Zongyuan Wang, D H Wei, P Weidenkaff,F Weidner, S P Wen,D J White,U Wiedner,G Wilkinson, M Wolke,L Wollenberg,J F Wu,L H Wu,L J Wu,X Wu,Z Wu,L Xia,H Xiao,S Y Xiao,Y J Xiao,Z J Xiao,X H Xie,Y G Xie,Y H Xie,T Y Xing, X A Xiong, G F Xu,J J Xu, Q J Xu,W Xu, X P Xu,L Yan,W B Yan,W C Yan,Xu Yan,H J Yang,H X Yang,L Yang,R X Yang,S L Yang,Y H Yang,Y X Yang,Yifan Yang,Zhi Yang,M Ye,M H Ye, J H Yin,Z Y You, B X Yu, C X Yu,G Yu, J S Yu,T Yu,C Z Yuan,W Yuan,X Q Yuan,Y Yuan,Z Y Yuan, C X Yue, A Yuncu, A A Zafar,Y Zeng, B X Zhang,Guangyi Zhang,H H Zhang,H Y Zhang,J L Zhang,J Q Zhang,J W Zhang,J Y Zhang, J Z Zhang,Jianyu Zhang,Jiawei Zhang,L Zhang,Lei Zhang,S Zhang,S F Zhang, T J Zhang,X Y Zhang,Y Zhang,Y H Zhang,Y T Zhang,Yan Zhang,Yao Zhang,Yi Zhang, Z H Zhang,Z Y Zhang,G Zhao,J Zhao,J Y Zhao,J Z Zhao,Lei Zhao,Ling Zhao,M G Zhao,Q Zhao,S J Zhao,Y B Zhao,Y X Zhao Zhao,Z G Zhao, A Zhemchugov,B Zheng, J P Zheng, Y Zheng, Y H Zheng,B Zhong,C Zhong, L P Zhou,Q Zhou,X Zhou,X K Zhou,X R Zhou,A N Zhu,J Zhu,K Zhu,K J Zhu,S H Zhu,W J Zhu, X L Zhu, Y C Zhu,Z A Zhu, B S Zou, J H Zou

PHYSICAL REVIEW LETTERS（2020）

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摘要

From 1310.6 x 10(6) J/psi and 448.1 x 10(6) psi (3686) events collected with the BESIII experiment, we report the first observation of Sigma(+) and (Sigma) over bar (-) spin polarization in e(+)e(-) -> J/psi[psi(3686)] -> Sigma(+)(Sigma) over bar (-) decays. The relative phases of the form factors Delta Phi have been measured to be (-15.5 +/- 0.7 +/- 0.5)degrees and (21.7 +/- 4.0 +/- 0.8)degrees with J/psi and psi(3686) data, respectively. The nonzero value of Delta Phi allows for a direct and simultaneous measurement of the decay asymmetry parameters of Sigma(+)-> p pi(0) (alpha(0) = -0.998 +/- 0.037 +/- 0.009) and (Sigma) over bar (-)-> (p) over bar pi(0) ((alpha) over bar (0) = 0.990 +/- 0.037 +/- 0.011), the latter value being determined for the first time. The average decay asymmetry, (alpha(0 )- (alpha) over bar (0))/2, is calculated to be -0.994 +/- 0.004 +/- 0.002. The CP asymmetry A(CP,Sigma) = (alpha(0) + (alpha) over bar (0))/(alpha(0) - (alpha) over bar (0)) = -0.004 +/- 0.037 +/- 0.010 is extracted for the first time, and is found to be consistent with CP conservation.

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