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Measurement of the branching fractions of the lepton using a tagged sample of decays

  • Author(s): Burchat, PR
  • Feldman, GJ
  • Barklow, T
  • Boyarski, AM
  • Burke, DL
  • Dorfan, JM
  • Gladney, L
  • Hanson, G
  • Hayes, K
  • Hollebeek, RJ
  • Innes, WR
  • Jaros, JA
  • Karlen, D
  • Lankford, AJ
  • Larsen, RR
  • Leclaire, BW
  • Lockyer, NS
  • Lüth, V
  • Matteuzzi, C
  • Ong, RA
  • Perl, ML
  • Richter, B
  • Riles, K
  • Ross, MC
  • Yelton, JM
  • Zaiser, C
  • Abrams, GS
  • Amidei, D
  • Baden, AR
  • Boyer, J
  • Butler, F
  • Gidal, G
  • Gold, MS
  • Goldhaber, G
  • Golding, L
  • Haggerty, J
  • Herrup, D
  • Juricic, I
  • Kadyk, JA
  • Nelson, ME
  • Rowson, PC
  • Schellman, H
  • Schmidke, WB
  • Sheldon, PD
  • Trilling, GH
  • De La Vaissiere, C
  • Wood, DR
  • Levi, ME
  • Schaad, T
  • et al.
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.

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