1. Measurement of the branching fractions of the tau lepton using a tagged sample of tau decays
- Author
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A. J. Lankford, G. J. Feldman, Patricia R. Burchat, D. Karlen, Darien Wood, Burton Richter, J. Boyer, George H. Trilling, J. M. Yelton, D. Amidei, A. R. Baden, J. Dorfan, J. A. Kadyk, L. Golding, Michael Levi, F. Butler, I. Juricic, George Gidal, A. M. Boyarski, M. L. Perl, R. R. Larsen, W. B. Schmidke, H. Schellman, Marc Ross, Gerson Goldhaber, K. Riles, L. Gladney, Walter R. Innes, N. S. Lockyer, Kenneth G. Hayes, D. L. Burke, C. De La Vaissiere, J. Haggerty, C. Matteuzzi, C. Zaiser, P. D. Sheldon, R. A. Ong, T. Schaad, G. Hanson, R. J. Hollebeek, M. S. Gold, D. Herrup, Mark E. Nelson, P. C. Rowson, B. W. Leclaire, J. A. Jaros, G. S. Abrams, V. Luth, Timothy Barklow, Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Physics ,Nuclear physics ,Particle physics ,Pion ,Annihilation ,Meson ,Branching fraction ,Electron–positron annihilation ,Hadron ,High Energy Physics::Experiment ,Branching (polymer chemistry) ,Lepton - Abstract
The branching fractions for the major decay modes of the lepton are measured from a sample of tagged decays selected from +- pairs produced in e+e- annihilation. The decay products of one member of the +- pair are used to identify the event. The opposite member of the pair is then included in the sample if it satisfies an invariant-mass cut and a charged-multiplicity cut. In this way, we attempt to select an unbiased sample of decays. The sample is divided into categories based on charged- and neutral-particle multiplicities, and charged-particle identification. The branching fractions are measured simultaneously, with an unfold technique and a maximum-likelihood fit, with the sum of the branching fractions constrained to be unity. The branching fractions for the decay modes - K- and - K*- are fixed at the world averages in the fit. The following branching fractions are measured: B(-e) =(19.10.81.1)%, B(-' - )=(18.30.90.8)%, B(-) =(10.01.1 *1,4)%, B(-0) =(25.81.72.5)%, B(-(n0, n>1))=(12.01.42.5)%, B(-+-) =(6.7 0.80.9)%, and B(-+- (n0,n>0)) =(6.10.80.9)%. The total branching fraction to one charged pion plus at least one neutral hadron is measured to be (37.81.21.0)%. Limits on allowed decay modes involving the meson are discussed. © 1987 The American Physical Society.
- Published
- 1987