Experimental upper limits on branching fractions for unexpected decay modes of thelepton
- 1 June 1982
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 25 (11), 2869-2886
- https://doi.org/10.1103/physrevd.25.2869
Abstract
Searches for 12 neutrinoless decay modes of the which violate lepton-number conservation have been made using the reaction . 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 are 0.055 and 0.064%, respectively. For the charged lepton decays , , , 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 , , , , , and . We also use these data to search for the pair production in annihilation of some unconventional particles with masses less than about 3 GeV/.
Keywords
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