Precise measurement of the branching fraction for the decay tau --> nu tau pi.

W. T. Ford,N. Qi,Alexander Lincoln Read, J. R. Smith,Tiziano Camporesi, Peruzzi I I,M. Piccolo,R. B. Hurst,Kwong Lau,J. Pyrlik,J. P. Venuti,H. B. Wald,Roy Weinstein,H. R. Band,M. W. Gettner,G. P. Goderre,J. H. Moromisato,W. D. Shambroom,J. C. Sleeman,von Goeler E,W. W. Ash,G. B. Chadwick,R. E. Leedy,R. Messner,L. J. Moss,F. Muller,H. N. Nelson,D. M. Ritson,L. J. Rosenberg,D. E. Wiser,R. W. Zdarko,D. E. Groom,Piero Giorgio Verdini,M. C. Delfino, Johnson,T. L. Lavine,T. Maruyama,R. Prepost

Physical Review D（1987）

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摘要
A sample of events from the process e/sup +/e/sup -/..-->..tau/sup +/tau/sup -/ observed with the MAC detector operating at the SLAC storage ring PEP is used for a precise measurement of B/sub ..pi../, the branching fraction for the decay tau..--> nu../sub tau/..pi... The result B/sub ..pi../ = 0.107 +- 0.005 +- 0.008 is obtained from a sample of events with 798 identified pions.
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precise measurement
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