Phys. Rev. D
65,
052004
(2002)
[5 pages]
First measurement of the branching fraction of the decay ψ(2S)→τ+τ-
J. Z. Bai et al. (BES Collaboration)
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J. Z. Bai1, Y. Ban11, J. G. Bian1, I. Blum19, A. D. Chen1, H. F. Chen18, H. S. Chen1, J. Chen5, J. C. Chen1, X. D. Chen1, Y. Chen1, Y. B. Chen1, B. S. Cheng1, S. P. Chi1, Y. P. Chu1, J. B. Choi4, X. Z. Cui1, Y. S. Dai21, L. Y. Dong1, Z. Z. Du1, W. Dunwoodie15, H. Y. Fu1, L. P. Fu8, C. S. Gao1, P. Gratton19, S. D. Gu1, Y. F. Gu1, Y. N. Guo1, Z. J. Guo1, S. W. Han1, Y. Han1, F. A. Harris16, J. He1, J. T. He1, K. L. He1, M. He12, X. He1, T. Hong1, Y. K. Heng1, D. G. Hitlin2, G. Y. Hu1, H. M. Hu1, Q. H. Hu1, T. Hu1, G. S. Huang3, X. P. Huang1, Y. Z. Huang1, J. M. Izen19, X. B. Ji12, C. H. Jiang1, Y. Jin1, B. D. Jones19, J. S. Kang9, Z. J. Ke1, M. H. Kelsey2, B. K. Kim19, H. J. Kim14, S. K. Kim14, T. Y. Kim14, D. Kong16, Y. F. Lai1, A. Lankford17, D. Li1, H. B. Li1, H. H. Li7, J. Li1, J. C. Li1, P. Q. Li1, Q. J. Li1, R. Y. Li1, W. Li1, W. G. Li1, X. N. Li1, X. Q. Li10, B. Liu1, F. Liu7, Feng. Liu1, H. M. Liu1, J. Liu1, J. P. Liu20, T. R. Liu1, R. G. Liu1, Y. Liu1, Z. X. Liu1, X. C. Lou19, B. Lowery19, G. R. Lu6, F. Lu1, J. G. Lu1, Z. J. Lu1, X. L. Luo1, E. C. Ma1, J. M. Ma1, R. Malchow5, H. S. Mao1, Z. P. Mao1, X. C. Meng1, X. H. Mo1, J. Nie1, Z. D. Nie1, S. L. Olsen16, J. Oyang2, D. Paluselli16, L. J. Pan16, J. Panetta2, H. Park9, F. Porter2, N. D. Qi1, X. R. Qi1, C. D. Qian13, J. F. Qiu1, Y. K. Que1, G. Rong1, M. Schernau7, Y. Y. Shao1, B. W. Shen1, D. L. Shen1, H. Shen1, X. Y. Shen1, H. Y. Sheng1, F. Shi1, H. Z. Shi1, X. F. Song1, J. Standifird19, J. Y. Suh9, H. S. Sun1, L. F. Sun1, Y. Z. Sun1, S. Q. Tang1, W. Toki5, G. L. Tong1, G. S. Varner6, J. Wang1, J. Z. Wang1, L. Wang1, L. S. Wang1, Meng Wang1, P. Wang1, P. L. Wang1, S. M. Wang1, Y. Y. Wang1, Z. Y. Wang1, M. Weaver2, C. L. Wei1, J. M. Wu1, N. Wu1, D. M. Xi1, X. M. Xia1, X. X. Xie1, G. F. Xu1, Y. Xu1, S. T. Xue1, W. B. Yan1, W. G. Yan1, C. M. Yang1, C. Y. Yang1, G. A. Yang1, H. X. Yang1, X. F. Yang1, M. H. Ye3, S. W. Ye18, Y. X. Ye18, C. S. Yu1, C. X. Yu1, G. W. Yu1, Y. Yuan1, B. Y. Zhang1, C. Zhang1, C. C. Zhang1, D. H. Zhang1, H. L. Zhang1, H. Y. Zhang1, J. Zhang1, J. W. Zhang1, L. Zhang1, L. S. Zhang1, P. Zhang1, Q. J. Zhang1, S. Q. Zhang1, X. Y. Zhang12, Y. Y. Zhang1, Z. P. Zhang18, D. X. Zhao1, H. W. Zhao1, Jiawei Zhao18, J. W. Zhao1, M. Zhao1, P. P. Zhao1, W. R. Zhao1, Y. B. Zhao1, Z. G. Zhao1, J. P. Zheng1, L. S. Zheng1, Z. P. Zheng1, B. Q. Zhou1, G. M. Zhou1, L. Zhou1, K. J. Zhu1, Q. M. 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
2California Institute of Technology, Pasadena, California 91125
3China Center of Advanced Science and Technology, Beijing 100080, People’s Republic of China
4Chonbuk National University, Chonju 561-756, Korea
5Colorado State University, Fort Collins, Colorado 80523
6Henan Normal University, Xinxiang 453002, People’s Republic of China
7Huazhong Normal University, Wuhan 430079, People’s Republic of China
8Hunan University, Changsha 410082, People’s Republic of China
9Korea University, Seoul 136-701, Korea
10Nankai University, Tianjin 300071, People’s Republic of China
11Peking University, Beijing 100871, People’s Republic of China
12Shandong University, Jinan 250100, People’s Republic of China
13Shanghai Jiaotong University, Shanghai 200030, People’s Republic of China
14Seoul National University, Seoul 151-742, Korea
15Stanford Linear Accelerator Center, Stanford, California 94309
16University of Hawaii, Honolulu, Hawaii 96822
17University of California at Irvine, Irvine, California 92717
18University of Science and Technology of China, Hefei 230026, People’s Republic of China
19University of Texas at Dallas, Richardson, Texas 75083-0688
20Wuhan University, Wuhan 430072, People’s Republic of China
21Zhejiang University, Hangzhou 310028, People’s Republic of China
Received 16 November 2000; revised 26 September 2001; published 31 January 2002
The branching fraction of the ψ(2S) decay into τ+τ- has been measured for the first time using the BES detector at the Beijing Electron-Positron Collider. The result is Bττ=(2.71±0.43±0.55)×10-3, where the first error is statistical and the second is systematic. This value, along with those for the branching fractions into e+e- and μ+μ- of this resonance, satisfy well the relation predicted by the sequential lepton hypothesis. Combining all these values with the leptonic width of the resonance, the total width of the ψ(2S) is determined to be (252±37)keV.
© 2002 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.65.052004
DOI:
10.1103/PhysRevD.65.052004
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