Measurement Of The Branching Fraction Of D-S Inclusive Semileptonic Decay D-S(+)->E(+)X

J. Z. Bai,O. Bardon,J. G. Bian,I. Blum,A. Breakstone,T. Burnett,Z. W. Chai,G. P. Chen,H. F. Chen, J. Chen, J. C. Chen,S. M. Chen, Y. Chen,Y. B. Chen,Y. Q. Chen,B. S. Cheng,R. F. Cowan,X. Z. Cui,H. L. Ding,Z. Z. Du, W. Dunwoodie,X. L. Fan, J. Fang,M. Fero,C. S. Gao,M. L. Gao,S. Q. Gao,P. Gratton,J. H. Gu,S. D. Gu,W. X. Gu,Y. F. Gu,Y. N. Guo,S. W. Han,Y. Han,F. A. Harris,J. He,J. T. He, M. He,D. G. Hitlin,G. Y. Hu,J. L. Hu,Q. H. Hu, T. Hu,X. Q. Hu,X. P. Huang,Y. Z. Huang,J. M. Izen,Q. P. Jia, C. H. Jiang, S. Jin,Y. Jin,L. Jones,S. H. Kang,Z. J. Ke,M. H. Kelsey,B. K. Kim,D. Kong,Y. F. Lai,H. B. Lan,P. F. Lang,A. Lankford,J. Li,P. Q. Li,Q. Li,R. B. Li, W. Li, W. D. Li,W. G. Li,X. H. Li,X. N. Li,S. Z. Lin,F. Lu,H. M. Liu,J. Liu,J. H. Liu,Q. Liu,R. G. Liu, Y. Liu,Z. A. Liu,X. C. Lou,B. Lowery,J. G. Lu,J. Y. Lu,S. Q. Luo,Y. Luo,A. M. Ma,E. C. Ma,J. M. Ma,H. S. Mao,Z. P. Mao,R. Malchow,M. Mandelkern,X. C. Meng,H. L. Ni,J. Nie,S. L. Olsen,J. Oyang,D. Paluselli,L. J. Pan,J. Panetta,F. Porter,E. Prabhakar,N. D. Qi,J. F. Qiu,Y. H. Qu,Y. K. Que,G. Rong, M. Schernau,B. Schmid, J. Schultz,Y. Y. Shao,B. W. Shen,D. L. Shen,H. Shen,X. Y. Shen,H. Y. Sheng,H. Z. Shi,X. R. Shi,E. Soderstrom,X. F. Song,J. Standifird,D. Stoker,F. Sun,H. S. Sun,S. J. Sun,J. Synodinos,Y. P. Tan,S. Q. Tang,W. Toki,G. L. Tong,F. Wang,J. F. Wang,L. S. Wang,L. Z. Wang,M. Wang,Meng Wang,P. Wang,P. L. Wang,S. M. Wang,T. J. Wang,Y. Y. Wang,M. Weaver,C. L. Wei,W. J. Wisniewski,Y. G. Wu,D. M. Xi,X. M. Xia,P. P. Xie,W. J. Xiong,D. Z. Xu,G. F. Xu,R. S. Xu,Z. Q. Xu,S. T. Xue,J. Yan,W. G. Yan,C. M. Yang,C. Y. Yang,H. Yang,J. Yang,W. Yang,X. F. Yang,M. H. Ye,S. W. Ye,S. Z. Ye, K. Yi,K. Young,C. S. Yu,C. X. Yu,Z. Q. Yu,Z. T. Yu,C. Z. Yuan,B. Y. Zhang,C. C. Zhang,D. H. Zhang,Dehong Zhang,H. L. Zhang,J. Zhang,J. W. Zhang,L. S. Zhang, L. Zhang,Q. J. Zhang,S. Q. Zhang, X. Y. Zhang, Y. Zhang,Y. Y. Zhang,D. X. Zhao,H. W. Zhao,J. W. Zhao,M. Zhao,W. R. Zhao,J. P. Zheng,L. S. Zheng,Z. P. Zheng,G. P. Zhou,H. S. Zhou, L. Zhou,Y. H. Zhou,Q. M. Zhu,Y. C. Zhu,Y. S. Zhu,B. A. Zhuang

PHYSICAL REVIEW D（1997）

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摘要

The absolute inclusive semileptonic branching fraction of the D-s meson has been measured based on 22.3 pb(-1) of e(+)e(-) collision data collected with the Beijing Spectrometer at root s = 4.03 GeV. At this energy, the D-s are produced in pairs: e(+)e(-) --> Ds+Ds-. We reconstructed 171 +/- 21 +/- 15 D-s events in five hadronic decay modes. In the recoil system of these events, several D-s inclusive semileptonic decays were observed and the branching fraction is estimated to be B(D-s(+) --> e(+) X) = (7.7(-4.3-2.1)(+5-7+2.4))%.

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