ΛΛ̄, ΛΛ̄γ and ΛΛ̄π0 Productions in J/ ψ Decay

JingZhi Bai,Jianguo Bian,Zhengwei Chai,GuangPei Chen,Hongfang Chen,Jiangchuan Chen,ShaoMin Chen,Yaqing Chen,Yu Chen,Yuanbo Chen,BaoSen Cheng,XiangZong Cui,Huiliang Ding,Zhizhen Du,Xiaoling Fan,Jian Fang,Cuishan Gao,Meili Gao,Shuqi Gao,Jianhui Gu,Shudi Gu,Weixin Gu,Yifan Gu,Yanan Guo,Shiweng Han,Ying Han,JingTang He,Ju Jingtang,Mao He,GuiYun Hu,JingLiang Hu,Qionghui Hu,Tao Hu,Xiaoqing Hu,Xiuping Huáng,YinZhi Huang,Chunhua Jiang,Shan Jin,Yan Jin,Shuhui Kang,ZunJian Ke,Yuanfen Lai,Huibin Lan,Pengfei Lang,Jin Li,Peiqin Li,Qun Li,Rubo Li,Wei Li,Weidong Li,Weiguo Li,Xinhua Li,Xiaonan Li,Shuzi Lin,Huaimin Liu,Jing Liu,Jinghua Liu,Qi Liu,Rongguang Liu,Yong Liü,Zhen'An Liu,Fong Lü,JunGuang Lü,Jianye Lu,Shuanqun Luo,Yong Luo,Aimin Ma,Encheng Ma,Jimao Ma,Huishun Mao,Zepu Mao,Xiangcheng Meng,Huiling Ni,Jing Nie,NaDing Qi,Jinfa Qiu,Yunhe Qu,YouKun Que,Gang Rong,YuYing Shao, BenWei Shen,DingLi Shen,Hong Shen,Xiaoyan Shen,Huayi Sheng,Huanzhang Shi,Xiaofei Song,Fang Sun,HanSheng Sun,Shijun Sun,Yiping Tan,SuQiu Tang,Guoliang Tong,Feng Wang,Jufang Wang,Lingshu Wang,Linzhou Wang,Man Wang,Meng Wang

Kao Neng Wu Li Yu Ho Wu Li/High Energy Physics and Nuclear Physics（1998）

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摘要

The channels of J/ ψ decay into ΛΛ̄, ΛΛ̄γ and ΛΛ̄π0 are analyzed with 7.8 × 106 J/ ψ events collected by BES detector at BEPC Collider. The branching ratios for three channels and the angular distribution for the first channel are measured. The branching ratios are Br (J/ ψ→ΛΛ̄) = (1.08 ± 0.06 ± 0.24) × 10-3, Br (J/ ψ→ΛΛ̄γ) <1.6 × 10-4(90% CL) and Br (J/ψ→ΛΛ̄π0 ) = (2.3 ± 0.7 ± 0.8) × 10-4 respectively. The angular distribution for J/ψ→ΛΛ̄ is dN/dcosθ = N0 (1 + αcos2θ), α = 0.52 ± 0.33 ± 0.13.

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关键词

Λ particle,Angular distribution,Beijing spectrometer,Branching ratio,J/ ψ particle

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