Measurement of J/ψ decays into ΛΛ̄ π+π-

Medina Ablikim,J. Z. Bai,Y. Bai,Yang Ban,X. Cai,Hongfang Chen,Hesheng Chen,Jin Chen,Jiangchuan Chen,Yuanbo Chen,Y. P. Chu,Y. S. Dai,Z. Y. Deng,S. X. Du,Jian Fang,C. D. Fu, Y. Gao,Y. T. Gu,Z. J. Guo,Frederick A. Harris,Kanglin He,Mao He,Yuekun Heng,H. M. Hu,Tajamal Hussain,Tao Hu,G. S. Huang,XingTao Huang,Yanping Huang,Talib A. Hussain,Xiaobini Ji,X. S. Jiang,J. B. Jiao,Dan Jin,Shan Jin,Gang Li,Haibo Li,Jin Li,Lei Li, R. Y. Li,Weidong Li,Wugui Li,Xianlei Li,Xiaonan Li,Xueqian Li,Yan Liang,BeiJiang Liu,C. X. Liu, Fang Liu, Feng Liu,Hongbang Liu,HuaiMin Liu, Jie Liu, Q. Liu,R. G. Liu,Zhenan Liu,Fangjun Lu,G. R. Lu,Junguang Lü,X. L. Luo,F. C. Ma,H. L. Ma,Q. M. Ma,M. Q A Malik,Zepu Mao,Xiaohu Mo,J. Nie,Stephen Lars Olsen,Ronggang Ping,J. F. Qiu,Gang Rong,Xiangdong Ruan,L. Y. Shan,Lei Shang,C. P. Shen,X. Y. Shen,Huayi Sheng,Sbengsen Sun,S. S. Sun,Yi Sun,Z. J. Sun,X. W. Tang,J. P. Tian,Gary S. Varner,X. Wan,Lan Wang,Liang Wang,P. Wang,P. L. Wang,Yifang Wang,Zhigang Wang,ZhiYong Wang,C. L. Wei,D. H. Wei,N. Wu,Gang Xu,X. P. Xu,Y. Xu,M. L. Yan,Hai Yang,Ming Yang,Yongxu Yang,M. H. Ye,Y. X. Ye,C. X. Yu,Changzheng Yuan,Yo Yuan,Yun Zeng,B. X. Zhang,B. Y. Zhang,C. C. Zhang,D. H. Zhang,Hong Zhang,Hongyu Zhang,Jiawen Zhang,Jianyong Zhang,Xueyao Zhang,Yiyun Zhang,Ziping Zhang,J. W. Zhao,M. G. Zhao,Pingping Zhao,Z. G. Zhao,B. Zheng,H. Q. Zheng,Jianping Zheng,Z. P. Zheng,B. Zhong,Lin Zhou, K. J. Zhu, Q. M. Zhu,X. W. Zhu,Yingshun Zhu,Zian Zhu,Bingsong Zou

CHINESE PHYSICS C（2012）

引用 18|浏览117

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摘要

Based on 58 million J/psi events collected by the BES II detector at the BEPC, J/psi -> Lambda(Lambda) over bar pi(+)pi(-) is observed for the first time. The branching fraction is measured to be Br(J/psi -> Lambda(Lambda) over bar pi(+)pi(-)) = (4.30 +/- 0.13 +/- 0.99)x10(-3), excluding the decays to intermediate states, namely J/psi -> Xi(-)(Xi) over bar (+), J/psi -> Sigma(1385)(-)(Sigma) over bar (1385)(+), and J/psi -> Sigma(1385)(+)(Sigma) over bar (1385)(-). The branching fractions for these intermediate resonance channels are measured to be: Br(J/psi -> Xi(-)(Xi) over bar (+)) = (0.90 +/- 0.03 +/- 0.18) x 10(-3), Br(J/psi -> Sigma(1385)(-)(Sigma) over bar (1385)(+)) = (1.23 +/- 0.07 +/- 0.30) x 10(-3), and Br(J/psi -> Sigma(1385)(+)(Sigma) over bar (1385)(-)) = (1.50 +/- 0.08 +/- 0.38) x 10(-3), respectively. The angular distribution is of the form dN/d(cos theta) proportional to (1+ alpha cos(2)theta) with alpha = (0.35 +/- 0.29 +/- 0.06) for J/psi -> Xi(-)(Xi) over bar (+), alpha = (-0.54 +/- 0.22 +/- 0.10) for J/psi -> Sigma(1385)(-)(Sigma) over bar (1385)(+), and alpha = (-0.35 +/- 0.25 +/- 0.06) for J/psi -> Sigma(1385)(+)(Sigma) over bar (1385)(-).

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关键词

baryonic decays,branching fraction,alpha distribution

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