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Experimental upper limits on branching fractions for unexpected decay modes of the lepton

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

Searches for 12 neutrinoless decay modes of the which violate lepton-number conservation have been made using the reaction e+e-+-. No evidence for lepton-number violation is observed, and we have set upper limits (90% C.L.) on the branching ratio for each decay mode. The branching-ratio limits on the radiative decays and e are 0.055 and 0.064%, respectively. For the charged lepton decays ee, eee, and, the branching ratio limits are 0.040, 0.033, 0.044, and 0.049%, respectively. Upper limits on the branching ratios for the following charged lepton + neutral hadron decays are 0 (0.037%), 0 (0.044%), eK0 (0.13%), K0 (0.10%), 0 (0.21%), and 0 (0.082%). We also use these data to search for the pair production in e+e- annihilation of some unconventional particles with masses less than about 3 GeV/c2. © 1982 The American Physical Society.

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