Phys. Rev. D 67, 112001 (2003) [8 pages]
First evidence of ΛΛ̅ in χcJ decays
J. Z. Bai et al. (BES Collaboration)
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J. Z. Bai1, Y. Ban8, J. G. Bian1, X. Cai1, J. F. Chang1, H. F. Chen14, H. S. Chen1, J. Chen7, J. C. Chen1, Y. B. Chen1, S. P. Chi1, Y. P. Chu1, X. Z. Cui1, Y. M. Dai6, Y. S. Dai16, L. Y. Dong1, S. X. Du15, Z. Z. Du1, J. Fang1, S. S. Fang1, C. D. Fu1, H. Y. Fu1, L. P. Fu5, C. S. Gao1, M. L. Gao1, Y. N. Gao12, M. Y. Gong1, W. X. Gong1, S. D. Gu1, Y. N. Guo1, Y. Q. Guo1, Z. J. Guo13, S. W. Han1, F. A. Harris13, J. He1, K. L. He1, M. He9, X. He1, Y. K. Heng1, T. Hong1, H. M. Hu1, T. Hu1, G. S. Huang1, L. Huang5, X. P. Huang1, X. B. Ji1, C. H. Jiang1, X. S. Jiang1, D. P. Jin1, S. Jin1, Y. Jin1, Z. J. Ke1, Y. F. Lai1, F. Li1, G. Li1, H. H. Li4, J. Li1, J. C. Li1, K. Li5, Q. J. Li1, R. B. Li1, R. Y. Li1, W. Li1, W. G. Li1, X. Q. Li7, X. S. Li12, C. F. Liu15, C. X. Liu1, Fang Liu14, F. Liu4, H. M. Liu1, J. B. Liu1, J. P. Liu15, R. G. Liu1, Y. Liu1, Z. A. Liu1, Z. X. Liu1, G. R. Lu3, F. Lu1, H. J. Lu14, J. G. Lu1, Z. J. Lu1, X. L. Luo1, E. C. Ma1, F. C. Ma6, J. M. Ma1, Z. P. Mao1, X. C. Meng1, X. H. Mo2, J. Nie1, Z. D. Nie1, S. L. Olsen13, D. Paluselli13, H. P. Peng14, N. D. Qi1, C. D. Qian10, J. F. Qiu1, G. Rong1, D. L. Shen1, H. Shen1, X. Y. Shen1, H. Y. Sheng1, F. Shi1, L. W. Song1, H. S. Sun1, S. S. Sun14, Y. Z. Sun1, Z. J. Sun1, S. Q. Tang1, X. Tang1, D. Tian1, Y. R. Tian12, G. L. Tong1, G. S. Varner13, J. Wang1, J. Z. Wang1, L. Wang1, L. S. Wang1, M. Wang1, Meng Wang1, P. Wang1, P. L. Wang1, W. F. Wang1, Y. F. Wang1, Zhe Wang1, Z. Wang1, Zheng Wang1, Z. Y. Wang2, C. L. Wei1, N. Wu1, X. M. Xia1, X. X. Xie1, G. F. Xu1, Y. Xu1, S. T. Xue1, M. L. Yan14, W. B. Yan1, G. A. Yang1, H. X. Yang12, J. Yang14, S. D. Yang1, M. H. Ye2, Y. X. Ye14, J. Ying8, C. S. Yu1, G. W. Yu1, C. Z. Yuan1, J. M. Yuan1, Y. Yuan1, Q. Yue1, S. L. Zang1, Y. Zeng5, B. X. Zhang1, B. Y. Zhang1, C. C. Zhang1, D. H. Zhang1, H. Y. Zhang1, J. Zhang1, J. M. Zhang3, J. W. Zhang1, L. S. Zhang1, Q. J. Zhang1, S. Q. Zhang1, X. Y. Zhang9, Y. J. Zhang8, Yiyun Zhang11, Y. Y. Zhang1, Z. P. Zhang14, D. X. Zhao1, Jiawei Zhao14, J. W. Zhao1, P. P. Zhao1, W. R. Zhao1, Y. B. Zhao1, Z. G. Zhao1 *, J. P. Zheng1, L. S. Zheng1, Z. P. Zheng1, X. C. Zhong1, B. Q. Zhou1, G. M. Zhou1, L. Zhou1, N. F. Zhou1, K. J. Zhu1, Q. M. Zhu1, Yingchun Zhu1, Y. C. Zhu1, Y. S. Zhu1, Z. A. Zhu1, B. A. Zhuang1, and B. S. Zou1 (BES Collaboration)
1Institute of High Energy Physics, Beijing 100039, People’s Republic of China
2China Center of Advanced Science and Technology, Beijing 100080, People’s Republic of China
3Henan Normal University, Xinxiang 453002, People’s Republic of China
4Huazhong Normal University, Wuhan 430079, People’s Republic of China
5Hunan University, Changsha 410082, People’s Republic of China
6Liaoning University, Shenyang 110036, People’s Republic of China
7Nankai University, Tianjin 300071, People’s Republic of China
8Peking University, Beijing 100871, People’s Republic of China
9Shandong University, Jinan 250100, People’s Republic of China
10Shanghai Jiaotong University, Shanghai 200030, People’s Republic of China
11Sichuan University, Chengdu 610064, People’s Republic of China
12Tsinghua University, Beijing 100084, People’s Republic of China
13University of Hawaii, Honolulu, Hawaii 96822
14University of Science and Technology of China, Hefei 230026, People’s Republic of China
15Wuhan University, Wuhan 430072, People’s Republic of China
16Zhejiang University, Hangzhou 310028, People’s Republic of China
Received 7 April 2003; published 3 June 2003
The first observation of χcJ (J=0,1,2) decays to ΛΛ̅ is reported using ψ(2S) data collected with the Beijing Spectrometer detector at the Beijing Electron Positron Collider. The branching ratios are determined to be B(χc0→ΛΛ̅ )=(4.7-1.2+1.3±1.0)×10-4, B(χc1→ΛΛ̅ )=(2.6-0.9+1.0±0.6)×10-4 and B(χc2→ΛΛ̅ )=(3.3-1.3+1.5±0.7)×10-4. The results are compared with model predictions.
©2003 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevD.67.112001
DOI: 10.1103/PhysRevD.67.112001
PACS: 13.25.Gv, 12.38.Qk, 14.40.Gx
* Present address: University of Michigan, Ann Arbor, Michigan 48109 USA.
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