A study of the decayτ−→π−μτ

C.A. Blocker,J.M. Dorfan,G.S. Abrams,M.S. Alam, A. Blondel,A.M. Boyarski,M. Breidenbach,D.L. Burke,W.C. Carithers, W. Chinowsky, M.W. Coles,S. Cooper, W.E. Dieterle, J.B. Dillon, J. Dorenbosch, M.W. Eaton,G.J. Feldman,M.E.B. Franklin, G. Gidal, G. Goldhaber, G. Hanson,K.G. Hayes,T. Himel,D.G. Hitlin,R.J. Hollebeek,W.R. Innes,J.A. Jaros,P. Jenni,A.D. Johnson,J.A. Kadyk,A.J. Lankford,R.R. Larsen,M. Levi, V. Lu¨th, R.E. Millikan,M.E. Nelson,C.Y. Pang, J.F. Patrick,M.L. Perl, B. Richter, A. Roussarie, D.L. Scharre,R.H. Schindler,R.F. Schwitters,J.L. Siegrist, J. Strait, H. Taureg, M. Tonutti,G.H. Trilling, E.N. Vella,R.A. Vidal, I. Videau,J.M. Weiss, H. Zaccone

Physics Letters B（1982）

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摘要

We present a high statistics measurement of the branching ratio for the decay τ-→π-μτ using data obtained with the Mark II detector at the SLAC e+e- storage ring SPEAR. We have used events from the center-of-mass energy region 3.52 to 6.7 GeV to determine that B(τ-→π-μτ)=0.117±0.004±0.018. From electron-muon events in the same data sample, we have determined that B(τ-→π-μτ) B(τ-→e--μeμτ)=0.66±0.03±0.11. We present measurements of the mass and spin of the τ and the mass of the τ neutrino based, for the first time, on a hadronic decay mode of the τ. © 1982.

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