Measurement of the branching fraction scrB(τ-→h- →π0ντ)

Marina Artuso,M. Goldberg,D. He,N. Horwitz,R. Kennett,R. Mountain,G. C. Moneti,F. Muheim,Yurii V. Mukhin,S. Playfer,Yoram Rozen,Sheldon Stone,M. Thulasidas,G. Vasseur,Xiangjun Xing,G. Zhu,John E. Bartelt,S. E. Csorna,Z. Egyed,Vipul Jain,K. Kinoshita,B. C. Barish,M. Chadha,S. Chan,D. F. Cowen,G. Eigen, J. S. Miller,C. O'Grady,J. Urheim,A. J.R. Weinstein,Darin Acosta,M. Athanas,G. Masek,H. P. Paar,M. Sivertz,J. Gronberg,Robert K. Kutschke, S. Menary,R. J. Morrison,S. Nakanishi,H. N. Nelson,T. K. Nelson,C. Qiao,J. D. Richman,Anders Ryd,H. Tajima,David Sperka,Michael S. Witherell,M. Procario,R. Balest,K. Cho,M. Daoudi,W. T. Ford,D. R. Johnson,K. Lingel,M. Lohner,P. Rankin,J. G. Smith, J. P. Alexander,C. Bebek,Karl Berkelman,Kenneth Bloom,T. E. Browder,D. G. Cassel,H. A. Cho,D. M. Coffman,D. S. Crowcroft,P. S. Drell,R. Ehrlich,P. Gaidarev,R. S. Galik,M. Garcia-Sciveres,B. Geiser,B. Gittelman,S. W. Gray,D. L. Hartill,B. K. Heltsley,C. D. Jones,S. L. Jones,J. Kandaswamy,N. Katayama,P. C. Kim,D. L. Kreinick,G. S. Ludwig,J. Masui,J. Mevissen,N. B. Mistry,C. R. Ng,E. Nordberg,Juliet Ritchie Patterson,D. Peterson,D. Riley,S. Salman, M. Sapper,Frank Würthwein,Paul Avery,A. P. Freyberger,J. L. Rodriguez,R. Stephens,Shengfeng Yang

Physical Review Letters（1994）

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摘要

Using data from the CLEO II detector at the Cornell Electron Storage Ring, we measure [ital scrB]([tau][sup [minus]][r arrow][ital h][sup [minus]][pi][sup 0][nu][sub [tau]]) where [ital h][sup [minus]] refers to either [pi][sup [minus]] or [ital K][sup [minus]]. We use three different methods to measure this branching fraction. The combined result is [ital scrB]([tau][sup [minus]][r arrow][ital h][sup [minus]][pi][sup 0][nu][sub [tau]])=0.2587[plus minus]0.0012[plus minus]0.0042, in good agreement with standard model predictions.

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parton distributions

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