Improved measurement of psi(2S) decays into tau⁺tau^-

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M. Ablikim,¹ J. Z. Bai,¹ Y. Ban,¹² J. G. Bian,¹ X. Cai,¹ H. F. Chen,¹⁷ H. S. Chen,¹ H. X. Chen,¹ J. C. Chen,¹ Jin Chen,¹ Y. B. Chen,¹ S. P. Chi,² Y. P. Chu,¹ X. Z. Cui,¹ Y. S. Dai,¹⁹ L. Y. Diao,⁹ Z. Y. Deng,¹ Q. F. Dong,¹⁵ S. X. Du,¹ J. Fang,¹ S. S. Fang,² C. D. Fu,¹ C. S. Gao,¹ Y. N. Gao,¹⁵ S. D. Gu,¹ Y. T. Gu,⁴ Y. N. Guo,¹ Y. Q. Guo,¹ Z. J. Guo,¹⁶ F. A. Harris,¹⁶ K. L. He,¹ M. He,¹³ Y. K. Heng,¹ H. M. Hu,¹ T. Hu,¹ G. S. Huang,¹ X. T. Huang,¹³ X. B. Ji,¹ X. S. Jiang,¹ X. Y. Jiang,⁵ J. B. Jiao,¹³ D. P. Jin,¹ S. Jin,¹ Yi Jin,⁸ Y. F. Lai,¹ G. Li,² H. B. Li,¹ H. H. Li,¹ J. Li,¹ R. Y. Li,¹ S. M. Li,¹ W. D. Li,¹ W. G. Li,¹ X. L. Li,¹ X. N. Li,¹ X. Q. Li,¹¹ Y. L. Li,⁴ Y. F. Liang,¹⁴ H. B. Liao,¹ B. J. Liu,¹ C. X. Liu,¹ F. Liu,⁶ Fang Liu,¹ H. H. Liu,¹ H. M. Liu,¹ J. Liu,¹² J. B. Liu,¹ J. P. Liu,¹⁸ Q. Liu,¹ R. G. Liu,¹ Z. A. Liu,¹ Y. C. Lou,⁵ F. Lu,¹ G. R. Lu,⁵ J. G. Lu,¹ C. L. Luo,¹⁰ F. C. Ma,⁹ H. L. Ma,¹ L. L. Ma,¹ Q. M. Ma,¹ X. B. Ma,⁵ Z. P. Mao,¹ X. H. Mo,¹ J. Nie,¹ S. L. Olsen,¹⁶ H. P. Peng,¹⁷ R. G. Ping,¹ N. D. Qi,¹ H. Qin,¹ J. F. Qiu,¹ Z. Y. Ren,¹ G. Rong,¹ L. Y. Shan,¹ L. Shang,¹ C. P. Shen,¹ D. L. Shen,¹ X. Y. Shen,¹ H. Y. Sheng,¹ H. S. Sun,¹ J. F. Sun,¹ S. S. Sun,¹ Y. Z. Sun,¹ Z. J. Sun,¹ Z. Q. Tan,⁴ X. Tang,¹ G. L. Tong,¹ G. S. Varner,¹⁶ D. Y. Wang,¹ L. Wang,¹ L. L. Wang,¹ L. S. Wang,¹ M. Wang,¹ P. Wang,¹ P. L. Wang,¹ W. F. Wang,¹ Y. F. Wang,¹ Z. Wang,¹ Z. Y. Wang,¹ Zhe Wang,¹ Zheng Wang,² C. L. Wei,¹ D. H. Wei,¹ N. Wu,¹ X. M. Xia,¹ X. X. Xie,¹ G. F. Xu,¹ X. P. Xu,⁶ Y. Xu,¹¹ M. L. Yan,¹⁷ H. X. Yang,¹ Y. X. Yang,³ M. H. Ye,² Y. X. Ye,¹⁷ Z. Y. Yi,¹ G. W. Yu,¹ C. Z. Yuan,¹ J. M. Yuan,¹ Y. Yuan,¹ S. L. Zang,¹ Y. Zeng,⁷ Yu Zeng,¹ B. X. Zhang,¹ B. Y. Zhang,¹ C. C. Zhang,¹ D. H. Zhang,¹ H. Q. Zhang,¹ H. Y. Zhang,¹ J. W. Zhang,¹ J. Y. Zhang,¹ S. H. Zhang,¹ X. M. Zhang,¹ X. Y. Zhang,¹³ Yiyun Zhang,¹⁴ Z. P. Zhang,¹⁷ D. X. Zhao,¹ J. W. Zhao,¹ M. G. Zhao,¹ P. P. Zhao,¹ W. R. Zhao,¹ Z. G. Zhao,¹ H. Q. Zheng,¹² J. P. Zheng,¹ Z. P. Zheng,¹ L. Zhou,¹ N. F. Zhou,¹ K. J. Zhu,¹ Q. M. Zhu,¹ Y. C. Zhu,¹ Y. S. Zhu,¹ Yingchun Zhu,¹ Z. A. Zhu,¹ B. A. Zhuang,¹ X. A. Zhuang,¹ and B. S. Zou¹

(BES Collaboration)

¹Institute of High Energy Physics, Beijing 100049, People's Republic of China
²China Center for Advanced Science and Technology (CCAST), Beijing 100080, People's Republic of China
³Guangxi Normal University, Guilin 541004, People's Republic of China
⁴Guangxi University, Nanning 530004, People's Republic of China
⁵Henan Normal University, Xinxiang 453002, People's Republic of China
⁶Huazhong Normal University, Wuhan 430079, People's Republic of China
⁷Hunan University, Changsha 410082, People's Republic of China
⁸Jinan University, Jinan 250022, People's Republic of China
⁹Liaoning University, Shenyang 110036, People's Republic of China
¹⁰Nanjing Normal University, Nanjing 210097, People's Republic of China
¹¹Nankai University, Tianjin 300071, People's Republic of China
¹²Peking University, Beijing 100871, People's Republic of China
¹³Shandong University, Jinan 250100, People's Republic of China
¹⁴Sichuan University, Chengdu 610064, People's Republic of China
¹⁵Tsinghua University, Beijing 100084, People's Republic of China
¹⁶University of Hawaii, Honolulu, Hawaii 96822, USA
¹⁷University of Science and Technology of China, Hefei 230026, People's Republic of China
¹⁸Wuhan University, Wuhan 430072, People's Republic of China
¹⁹Zhejiang University, Hangzhou 310028, People's Republic of China

Received 17 September 2006; revised 27 November 2006; published 21 December 2006

Using14M psi(2S) events collected at BESII, the branching fraction ofpsi(2S)-->tau⁺tau^- is measured to be Br_tautau=(3.08±0.21±0.38)×10^-3, where the first erroris statistical and the second is systematic.

URL:	http://link.aps.org/doi/10.1103/PhysRevD.74.112003
DOI:	10.1103/PhysRevD.74.112003
PACS:	13.20.Gd; 14.40.Gx; 14.60.Fg 13.20.Gd Leptonic/semileptonic decays of J/psi, Upsilon and other quarkonia 14.40.Gx Mesons with S=C=B=0, mass > 2.5 GeV (including quarkonia) 14.60.Fg Taus YEAR: 2006
KEYWORDS:	meson leptonic decay, psi mesons