Improved measurement of absolute branching fraction of Ds+→τ+ντ

P. U. E. Onyisi,J. L. Rosner,J. P. Alexander,D. G. Cassel,J. E. Duboscq,R. Ehrlich,L. Fields,R. Galik, L. Gibbons,R. Gray, S. Gray,D. Hartill,B. Heltsley,D. Hertz,J. Hunt,J. Kandaswamy,D. Kreinick,V. Kuznetsov,J. Ledoux,H. Mahlke-Krüger,D. Mohapatra,J. Patterson, D. Peterson, D. Riley, A. Ryd,A. Sadoff, X. Shi,S. Stroiney, W. Sun,T. Wilksen,S. Athar, J. Yelton, P. Rubin, N. Lowrey,S. Mehrabyan,M. Selen,J. Wiss, R. Mitchell,M. Shepherd,D. Besson,T. Pedlar,D. Cronin-Hennessy,K. Gao,J. Hietala,Y. Kubota,T. Klein,R. Poling,A. Scott,P. Zweber,S. Dobbs,Z. Metreveli,K. Seth,B. Tan, A. Tomaradze,J. Libby,L. Martin,A. Powell, G. Wilkinson,H. Mendez,J. Ge,D. Miller, V. Pavlunin,B. Sanghi, I. Shipsey,B. Xin,G. Adams,D. Hu,B. Moziak,J. Napolitano, K. Ecklund,Q. He,J. Insler,H. Muramatsu,C. Park,E. Thorndike, F. Yang,M. Artuso,S. Blusk, S. Khalil, J. Li,R. Mountain, K. Randrianarivony,N. Sultana, T. Skwarnicki,S. Stone,J. Wang, L. Zhang,G. Bonvicini,D. Cinabro,M. Dubrovin,A. Lincoln,M. Smith,P. Naik, J. Rademacker,D. Asner, K. Edwards,J. Reed,A. Robichaud,G. Tatishvili,E. White, R. Briere, H. Vogel

PHYSICAL REVIEW D（2009）

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摘要

We have studied the leptonic decay D-s(+) -> tau(+) v(tau), via the decay channel tau(+) -> e(+) v(e) (v) over bar (tau), using a sample of tagged D-s(+) decays collected near the D-s*D-+/-(s)+/- peak production energy in e(+)e(-) collisions with the CLEO-c detector. We obtain B(D-s(+) -> tau(+) v(tau) ) = 5.30 +/- 0.47 +/- 0.22)% and determine the decay constant f(Ds) = (252.5 +/- 11.1 +/- 5.2) MeV, where the first uncertainties are statistical and the second are systematic.

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