Decay of the J/ψ to ∑0∑̄0 final state

JingZhi Bai,Yong Ban,Jianguo Bian,Jinfan Chang,AiDong Chen,Hongfang Chen,Hesheng Chen,Jiangchuan Chen,Xindong Chen,Yuanbo Chen,BaoSen Cheng,ShaoPeng Chi,Yuanping Chu,XiangZong Cui,YouShan Dai,LiaoYuan Dong,Zhizhen Du,HongYu Fu,LiPing Fu,Cuishan Gao,Shudi Gu,Zijin Guo,Yanan Guo,ShiWen Han,Ying Han,JingTang He,Ju Jingtang,KangLin He,Mao He,Xiang He,Yuekun Heng,Tao Hong,GuiYun Hu,Haiming Hu,Qionghui Hu,Tao Hu,GuangShun Huang,Xiuping Huáng,YinZhi Huang,XiaoBin Ji,Chunhua Jiang,Yan Jin,ZunJian Ke,Yuanfen Lai,De Li,Haibo Li,Huihong Li,Jiacai Li,Jin Li,Peiqin Li,Qiuju Li,RenYing Li,Wei Li,Weiguo Li,Xiaonan Li,Xueqian Li,Bin Liu,Feng Liu,Huaimin Liu,Jing Liu,Jueping Liu,Rongguang Liu,Tian Rong Liu,Yong Liü,ZhongXiu Liu,Fong Liu,GongRu Lu,Feng Lü,JunGuang Lü,ZhiJian Lü,XiaoLan Luo,Encheng Ma,Fengcai Ma,Jimao Ma,Zepu Mao,Xiangcheng Meng,XiaoHu Mo,Jing Nie,ZhenDong Nie,NaDing Qi,Xiangrong Qi,ChengDe Qian,Jinfa Qiu,YouKun Que,Gang Rong,YuYing Shao,BenWei Shen,DingLi Shen,Hong Shen,Xiaoyan Shen,Huayi Sheng,Feng Shi,Huanzhang Shi,Xiaofei Song,HanSheng Sun,LiangFeng Sun,YongZhao Sun,SuQiu Tang,Xiao Tang

Kao Neng Wu Li Yu Ho Wu Li/High Energy Physics and Nuclear Physics（2002）

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摘要

With 7.8 million produced J/ψ events collected by the BES detector at the BEPC, the decay J/ψ→∑0∑̄0 is analysed. The branching ratio is measured to be BR(J/ψ→∑0∑̄0) = (0.97 ± 0.04 ± 0.24) × 10-3. The angular distribution is of the form dN/dcosθ = N0(1 + αcos2θ) with α value of -0.21 ± 0.27 ± 0.13.

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关键词

∑0 particle,Angular distribution,Beijing spectrometer,Branching ratio,J/ψ particle

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