Observation of the decay psi(3686) -> Lambda(Sigma)over-bar(+/-) pi(-/+) + c.c M Ablikim , M N Achasov , X C Ai , O Albayrak , D Ambrose , F F An , Q An , J Z Bai , R Baldini Ferroli , Y Ban , J V Bennett , M Bertani , J M Bian , E Boger , O Bondarenko , I Boyko , S Braun , R A Briere , Hui Cai , X Cai , O Cakir , A Calcaterra , G F Cao , S A Cetin , J F Chang , Gueorgui Chelkov , G Chen , H S Chen , J C Chen , M L Chen , S J Chen , X R Chen , Y B Chen , H P Cheng , X K Chu , Y P Chu , D Croninhennessy , H L Dai , J P Dai , D V Dedovich , Z Y Deng , A G Denig , I Denysenko , M Destefanis , W M Ding , Y Ding , Chuang Dong , J Dong , L Y Dong , M Y Dong , S X Du , J Fang , S S Fang , Y Fang , L Fava , C Q Feng , C D Fu , J L Fu , O Fuks , Qinqin Gao , Y Gao , C Geng , K Goetzen , W X Gong , W Gradl , M Greco , M H Gu , Y T Gu , Y H Guan , A Q Guo , L B Guo , Tiantai Guo , Y P Guo , Y L Han , F A Harris , K L He , M He , Z Y He , T Held , Y K Heng , Z L Hou , C Hu , H M Hu , J F Hu , T Hu , G S Huang , J S Huang , Liping Huang , X T Huang , T Hussain , C S Ji , Q P Ji , X B Ji , L L Jiang , X S Jiang , J B Jiao , Z Jiao , D P Jin , S Jin , F F Jing , T Johansson , N Kalantarnayestanaki , X L Kang , M Kavatsyuk , B Kloss , B Kopf , M Kornicer , W Kuehn , A Kupsc , Weihong Lai , J S Lange , M Lara , P Larin , M Leyhe , C H Li , D M Li , Fufeng Li , Gengyin Li , H B Li , J C Li , K Li , Lei Li , P R Li , Q J Li , T Li , W D Li , X L Li , Z B Li , H Liang , Y F Liang , G R Liao , D X Lin , B J Liu , C L Liu , F H Liu , H B Liu , J P Liu , K Y Liu , P L Liu , Qingyang Liu , S B Liu , Xiaoyang Liu , Y B Liu , Z A Liu , H Loehner , X C Lou , G R Lu , H J Lu , J G Lu , X R Lu , Y P Lu , C L Luo , M X Luo , Tao Luo , X L Luo , Mingming Lv , F C Ma , H L Ma , Q M Ma , S Ma , T Ma , X Y Ma , F E Maas , M Maggiora , Q A Malik , Y J Mao , Z P Mao , J G Messchendorp , J Min , T J Min , R E Mitchell , X H Mo , H Moeini , C Morales Morales , K Moriya , N Yu Muchnoi , Y Nefedov , I B Nikolaev , Z Ning , S Nisar , X Y Niu , S L Olsen , Q Ouyang , S Pacetti , M Pelizaeus , H P Peng , K Peters , J L Ping , R G Ping , R Poling , E Prencipe , M Qi , S Qian , C F Qiao , L Q Qin , X S Qin , Y Qin , Z H Qin , J F Qiu , K H Rashid , C F Redmer , M Ripka , G Rong , X D Ruan , A V Sarantsev , K Schoenning , S Schumann , Wenjuan Shan , M Shao , C P Shen , X Y Shen , H Y Sheng , M R Shepherd , W M Song , X Y Song , S Spataro , B Spruck , G X Sun , J F Sun , S S Sun , Yu Jie Sun , Z T Sun , C J Tang , Xiang Tang , I Tapan , E H Thorndike , D Toth , M Ullrich , I Uman , G Varner , B Wang , D Y Wang , Ke Wang , L L Wang , M Wang , P L Wang , Q J Wang , S G Wang , Weixin Wang , X F Wang , Y F Wang , Z Y Wang , D H Wei , J B Wei , P Weidenkaff , S P Wen , U Wiedner , M Wolke , George G Wu , L H Wu , N Wu , Wenshu Wu , Zhiqiang Wu , L G Xia , Yang Xia , Dong Xiao , Z J Xiao , Y G Xie , Q L Xiu , G F Xu , Lin Xu , Q J Xu , X P Xu , Zhiquan Xue , Liang Yan , W B Yan , Y H Yan , H X Yang , Y X Yang , Hui Ye , M H Ye , B X Yu , C X Yu , H W Yu , J S Yu , S P Yu , C Z Yuan , W L Yuan , Yuan Yuan , A A Zafar , A Zallo , S L Zang , Yu Zeng , B Y Zhang , C C Zhang , D H Zhang , H Y Zhang , J W Zhang , S H Zhang , Xiang Yang Zhang , Yang Huan Zhang , Z Y Zhang , G Zhao , J W Zhao , Lei Zhao , M G Zhao , Q W Zhao , S J Zhao , T C Zhao , X H Zhao , Y B Zhao , Z G Zhao , A Zhemchugov , Bojian Zheng , Y H Zheng , B Zhong , Liping Zhou , X Y Zhou , K J Zhu , Xiao Li Zhu , Y S Zhu , Z A Zhu , J Zhuang , B S Zou , J H Zou , M Werner , J P Zheng PHYSICAL REVIEW D(2013)
Abstract
Using a sample of 1:06 X 10(8) psi(3686) events collected with the BESIII detector, we present the first observation of the decays of psi(3686) -> Lambda(Sigma) over bar (+) pi(-) + c.c. and psi(3686) -> Lambda(Sigma) over bar (-) pi(+) + c.c. The branching fractions are measured to be B(psi(3686) -> Lambda(Sigma) over bar (+) pi(-) + c.c.) = (1.40 +/- 0.03 +/- 0.13) X 10(-4) and B(psi(3686) -> Lambda (Sigma) over bar (-) pi(+) + c.c.) = (1.54 +/- 0.04 +/- 0.13) X 10(-4) where the first errors are statistical and the second ones systematic.
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