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A study of the decay τ-→π-μτ

  • Author(s): Blocker, CA;
  • Dorfan, JM;
  • Abrams, GS;
  • Alam, MS;
  • Blondel, A;
  • Boyarski, AM;
  • Breidenbach, M;
  • Burke, DL;
  • Carithers, WC;
  • Chinowsky, W;
  • Coles, MW;
  • Cooper, S;
  • Dieterle, WE;
  • Dillon, JB;
  • Dorenbosch, J;
  • Eaton, MW;
  • Feldman, GJ;
  • Franklin, MEB;
  • Gidal, G;
  • Goldhaber, G;
  • Hanson, G;
  • Hayes, KG;
  • Himel, T;
  • Hitlin, DG;
  • Hollebeek, RJ;
  • Innes, WR;
  • Jaros, JA;
  • Jenni, P;
  • Johnson, AD;
  • Kadyk, JA;
  • Lankford, AJ;
  • Larsen, RR;
  • Levi, M;
  • Lüth, V;
  • Millikan, RE;
  • Nelson, ME;
  • Pang, CY;
  • Patrick, JF;
  • Perl, ML;
  • Richter, B;
  • Roussarie, A;
  • Scharre, DL;
  • Schindler, RH;
  • Schwitters, RF;
  • Siegrist, JL;
  • Strait, J;
  • Taureg, H;
  • Tonutti, M;
  • Trilling, GH;
  • Vella, EN;
  • Vidal, RA;
  • Videau, I;
  • Weiss, JM;
  • Zaccone, H
  • et al.
Abstract

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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