- Main
Experimental upper limits on branching fractions for unexpected decay modes of the τ lepton
- 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;
- Lüth, 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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