First observation of the isospin violating decay J/ ψ→ΛΣ ̄0+c.c.

Medina Ablikim,Mikhail N. Achasov,David J. Ambrose,F. F. An,Qi AN,Zhenghua An,JingZhi Bai,Y. Ban,Julia K. Becker,Niklaus Berger,Monica B. Bertani,Jianming Bian,E. Boger,Olga A. Bondarenko, I. R. Boyko,Roy A. Briere,Vladimir V. Bytev,Xiao Cai,Osman Çakir,A. C. Calcaterra,Guofu Cao,Serkant A. Çetin,Jinfan Chang,Georgy A. Chelkov,Gang Chen,Hesheng Chen,Jin Chen,Mali Chen,San Chen,Yu Chen,Ying Chen,H. P. Cheng,Yuanping Chu,Daniel P. Cronin-Hennessy,Hongliang Dai,Jianping Dai,Dmitri V. Dedovich,Ziyan Deng,Achim G. Denig,I. Denysenko,M. F. Destefanis,W. M. Ding,Yong Ding,LiaoYuan Dong,Mingyi Dong,ShuXian Du,Jian Fang,Shuangshi Fang,Luciano Fava,F. Feldbauer,Changqing Feng,Rinaldo Baldini Ferroli,ChengDong Fu,Jie Fu,Ya Gao,Chao Geng,K. Goetzen,Wenxuan Gong,W. Gradl,Michela Greco,M. H. Gu,YunTing Gu,Ying Guan,Aiqiang Guo,Libo Guo,Yan Guo,Yong Han,X. Q. Hao,Frederick A. Harris,Kangling He,Mao He,Zhenya He,T. Held,Yuekun Heng,Zhilong Hou,Haiming Hu,Jifeng Hu,Tao Hu,Bin Huang,Guangming Huang,Jinshu Huang,Xu Huang,Y. P. Huang,Talib A. Hussain,Chen Ji,Quan Ji,XiaoBin Ji,Xiaolu Ji,LuKui Jia,Lei Jiang,XiaoShan Jiang,Jun Jiao,Zheng Jiao,Dapeng Jin,Shan Jin,F. F. Jing,Nasser Kalantar-Nayestanaki,M. O. Kavatsyuk,Wolfgang Kuehn,Wanchang Lai,Jens Sören Lange, Cui Li,Cheng Li, Cui Li,D. M. Li,Fang Li,Gang Li,Haibo Li,Jiacai Li,Kang Li,Lei Li,N. B. Li,Qiuju Li, Sheng Li,W. D. Li,WeiGuo Li,Xianlei Li,Xiaonan Li,Xueqian Li,Xiurong Li,Zhibing Li,Haojun Liang,Y. F. Liang,Yutie Liang,G. R. Liao,Xiaotao Liao,Beijiang Liu,C. L. Liu,C. X. Liu,Cheng Liu,Fuhu Liu,Fang Liu, Feng Liu,Hongwei Liu,Hongbang Liu,Huihui Liu,HuaiMin Liu,H. W. Liu,Jia Liu,Kuiyong Liu, Kai Liu,Kun Liu,Peng Liu, S. B. Liu,Xiang Liu,Xiaohai Liu,Yong Liu,Yan Liu,Zhen'An Liu,Zhiqiang Liu,Zhiqing Liu,Herbert Loehner,GongRu Lu,HaiJiang Lü,JunGuang Lü,Qiwen Lü,Xiaorui Lü,Yunpeng Lu,Chenglin Luo,Man Luo,Tao Luo,XiaoLan Luo,M. Lv,Chao Ma,Fengcai Ma,HaiLong Ma,Qiang Ma,Sixuan Ma,T. Ma,Xiang Ma,Yuqian Ma,Frank E. Maas,Marco Maggiora,Q. A. Malik,Huishun Mao,Yajun Mao,Zepu Mao,Johan G M Messchendorp,Jian Min,Tai Min,Ryan E. Mitchell,XiaoHu Mo,Cristina Morales Morales,C. Motzko,Nikolay Yu Muchnoi, H. Muramatsu,Yu A. Nefedov,Caitriana Nicholson,Ivan B. Nikolaev,Zhe Ning,Stephen Lars Olsen,Qun Ouyang,Simone P. Pacetti,J. W. Park,M. Pelizaeus,Hu Peng,Klaus J. Peters,Jialun Ping,Ronggang Ping,Ronald A. Poling,E. Prencipe,Ming Qi,Sen Qian,Congfeng Qiao,Xiaoshuai Qin,Yi Qin,ZhongHua Qin,Jing Qiu,K. H. Rashid,Gang Rong,XiangDong Ruan,Andrey V. Sarantsev,B. D. Schaefer,J. Schulze,Shao Ming,Chengping Shen,Xiaoyan Shen,Huayi Sheng,Matthew R. Shepherd,X. Y. Song,Stefano Spataro,Björn Spruck,D. H. Sun,Gongxing Sun,Jinfeng Sun,Shuaishuai Sun,XiaoDong Sun,YongJie Sun,Yi Sun, ZhiJia Sun,Zhe Sun,Changjian Tang,Xiaowei Tang,Xingfu Tang,Ilhan Tapan,Edward H. Thorndike,HaoLai Tian,Derrick Toth,Matthias Ullrich,Gary S. Varner,BaoRong Wang,Bing Wang,Kexiang Wang,LiangLiang Wang,Lan Wang,Meng Wang,Ping Wang,Peilin Wang,Qun Wang,Qian Wang,Shiguang Wang,Xiaolong Wang,Yandong Wang,Yifang Wang,Yongqiang Wang,Zhe Wang,Zhigang Wang,Zheng Wang,DaiHui Wei, P. Weidenkaff,Qungang Wen,Shuopin Wen,Marcel W. Werner,Ulrich Wiedner,LingHui Wu,Ning Wu,Si Wu,Wenjuan Wu,Ziyu Wu,Li Xia,Zhenjun Xiao,Yi Xie,Q. L. Xiu,Guang Xu,Guangming Xu,Hao Xu,Qingjun Xu,X. P. Xu,Zhangrun Xu,F. Xue,Zhen Xue,Litao Yan,Wang Yan,Yonghong Yan,Huan Yang,Yadong Yang,Yongxu Yang,H. Ye,Mei Ye,Minghan Ye,Boxiang Yu,Cao Yu,Jiesheng Yu,S. P Yu Yu,Chao Yuan,W. L. Yuan,Ye Yuan,Abrar Ahmed Zafar,Adriano Z. Zallo,Yun Zeng,BingXin Zhang,Bin Zhang,Changchun Zhang,D. H. Zhang,Hui Zhang,Hongyu Zhang,Jun Zhang,Jian Zhang,Jiawen Zhang,Jing Zhang,S. H. Zhang,T. R. Zhang,Xuan Zhang,Xueyao Zhang,Yi Zhang,Ying Zhang,Yao Zhang,Ziping Zhang,Zhenyu Zhang,Gongbo Zhao, Hui Zhao,Jiawei Zhao,Kan Zhao,Lei Zhao,Ling Zhao,Minggang Zhao,Qiang Zhao,Shujun Zhao,Tianchi Zhao,Xin Zhao,Yubin Zhao,Zhi Zhao,Alexey S. Zhemchugov,B. Zheng,Jian Zheng,Yangheng Zheng,Zhi Zheng,Bin Zhong,J. Zhong,Lijuan Zhou,Xin Zhou,C. Zhu, KeJun Zhu,Kai Zhu,Shihai Zhu,Xianglei Zhu,XiongWei Zhu,Y. C. Zhu,Y. M. Zhu,YongSheng Zhu,Zian Zhu,Jiejia Zhuang,Bingsong Zou,Jiaheng Zou,Jiaxu Zuo

PHYSICAL REVIEW D（2012）

引用 33|浏览195

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摘要

Using a sample of (225.2 +/- 2.8) x 10(6) J/psi events collected with the BESIII detector, we present results of a study of J/psi -> gamma Lambda(Lambda) over bar and report the first observation of the isospin violating decay J/psi -> Lambda(Sigma) over bar (0) + c.c., in which (Sigma) over bar (0) decays to gamma (Lambda) over bar. The measured branching fractions are B(J/psi -> (Lambda) over bar Sigma(0)) = (1.46 +/- 0.11 +/- 0.12) x 10(-5) and B(J/psi -> Lambda(Sigma) over bar (0)) = (1.37 +/- 0.12 +/- 0.11) x 10(-5). We search for Lambda(1520) -> gamma Lambda decay, and find no evident signal, and an upper limit for the product branching fraction B(J/psi -> Lambda(Lambda) over bar (1520) + c.c) x B(Lambda(1520) -> gamma Lambda) < 4.1 x 10(-6) is set at the 90% confidence level. We also report the observation of eta(c) -> Lambda<(Lambda)over bar> in J/psi -> gamma eta(c), eta(c) -> Lambda(Lambda) over bar and measure the branching fraction B(eta(c) -> Lambda(Lambda) over bar) = (1.16 +/- 0.12(stat) +/- 0.19(syst) +/- 0.28(PDG)) x 10(-3).

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