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Measurement of the mass of the τ lepton

Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields1996Vol. 53(1), pp. 20–34

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J. Z. Bai, O. Bardon, R. Becker-Szendy, I. Blum, A. Breakstone, T. H. Burnett, G. P. Chen, H. F. Chen, J. Chen, S. J. Chen, S. M. Chen, Y. Chen, Yuanmi Chen, Y. Q. Chen, B. S. Cheng, R. F. Cowan, H. Cui, X. Z. Cui, Hao Ding, Zhaocheng Du, W. Dunwoodie, X. L. Fan, J. Fang, Chong Gao, M. Gao, Shipeng Gao, W. X. Gao, P. Gratton, J. Gu, S. Gu, W. X. Gu, Y. F. Gu, Y. N. Guo, S. W. Han, Yaling Han, F. A. Harris, Makoto Hatanaka, J. He, K. R. He, M. He, D. G. Hitlin, G. Y. Hu, J. F. Hu, X. Q. Hu, D. Q. Huang, Yizhong Huang, J. M. Izen, Q. P. Jia, Chongyun Jiang, Zhengzhong Jiang, S. Jin, Y. Jin, Lawrence A. Jones, Shuming Kang, Z Ke, M.H. Kelsey, B. K. Kim, Yue Lai, H. Lan, P. F. Lang, A. J. Lankford, F. Li, J. Li, P. Q. Li, Qingfeng Li, R. B. Li, W. Li, W. D. Li, W. G. Li, X. H. Li, Xiaonan Li, Y. S. Li, Shi‐Zeng Lin, H. M. Liu, J. Liu, J. H. Liu, Q. Liu, R. G. Liu, Y. Liu, Z. A. Liu, X. C. Lou, B. Lowery, Feng Lü, J. G. Lu, Y. Luo, Angelin Rosy M, D. H., Christopher C. Enweremadu, J. M., H. S. Mao, Z. P. Mao, R. Malchow, M. Mandelkern, H. Marsiske, Xiangwu Meng, H. L. Ni, Jun Nie, S. L. Olsen, J. Oyang, D. Paluselli, L. J. Pan, J. Panetta, F. C. Porter, E. Prabhakar, N. D. Qi, Y. K. Que, J. Quigley, G. Rong, M. Schernau, Bernhard Schmid, J. Schultz, Y. Shao, B. W. Shen, D. L. Shen, Hong Shen, X. Y. Shen, H. Y. Sheng, H. Shi, Xiangdong Shi, A. Smith, E. Soderstrom, X. F. Song, J. Standifird, D. Stoker, Feifei Sun, H. S. Sun, S. J. Sun, J. Synodinos, Y. P. Tan, Selene Tang, W. H. Toki, G. L. Tong, E. Torrence, Fengyi Wang, L. S. Wang, L. Z. Wang, Meng Wang, P. Wang, P. L. Wang, Shuliang Wang, T. J. Wang, Y. Y. Wang, C. Wei, Sharon Whittaker, R. J. Wilson, W. J. Wisniewski, Y. G. Wu, D. M. Xi, X. M. Xia, P. P. Xie, X. X. Xie, W Xiong, Dazhuan Xu, Mingzhi Xu, R. Xu, Y.D. Xu, Zeqiu Xu, S. Xue, R. Yamamoto, Jian‐Min Yan, W. G. Yan, C. Yang, C. Y. Yang, Jiayu Yang, Yang Wang, H. Yao, M. H. Ye, Shengke Ye, S. Z. Ye, C. S. Yu, C. X. Yu, Y.H. Yu, Z. Q. Yu, C. Z. Yuan, J. Y. Zeng, B. Y. Zhang, C. C. Zhang, D. H. Zhang, H. L. Zhang, J. Zhang, J. W. Zhang, Linlin Zhang, S. Q. Zhang, Y. Zhang, Y. Y. Zhang, D.X. Zhao, H. W. Zhao, J. W. Zhao, Mengfei Zhao, P. D. Zhao, W. Zhao, J. P. Zheng, L. S. Zheng, Z. P. Zheng, Guanqun Zhou, H. Zhou, Li Zhou, Xuebing Zhou, Y. H. Zhou, H. G. Zhu, Q. M. Zhu, Y. C. Zhu, Y. S. Zhu, B.A. Zhuang, G. Zioulas

Abstract

A data-driven energy scan in the immediate vicinity of the \ensuremath{\tau} pair production threshold has been performed using the Beijing Spectrometer at the Beijing Electron-Positron Collider. Approximately 5 ${\mathrm{pb}}^{\mathrm{\ensuremath{-}}1}$ of data, distributed over 12 scan points, have been collected. A previous mass value for the \ensuremath{\tau} lepton, obtained using only the e\ensuremath{\mu} final state, has been published. In this paper, the final BES result on the mass measurement is presented. The analysis is based on the combined data from the ee, e\ensuremath{\mu}, eh, \ensuremath{\mu}\ensuremath{\mu}, \ensuremath{\mu}h, and hh final states, where h denotes a charged \ensuremath{\pi} or K. A maximum likelihood fit to the \ensuremath{\tau} pair production cross section data yields the value ${\mathit{m}}_{\mathrm{\ensuremath{\tau}}}$=1776.${96}_{\mathrm{\ensuremath{-}}0.21}$ -0.${17}^{+0.18\phantom{\rule{0ex}{0ex}}+0.25}$ MeV. \textcopyright{} 1995 The American Physical Society.

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Abstract

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