Cascade decays of heavy leptons produced by neutrinos
- 1 October 1977
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 16 (7), 2141-2157
- https://doi.org/10.1103/physrevd.16.2141
Abstract
Gauge models with two heavy leptons that decay sequentially are proposed as a mechanism for fast multilepton production by neutrinos. To quantify the predictions of such models, a specific SU(2) × U(1) model is constructed and realistic calculations are made of the heavy-lepton production and decay sequence: ,, . Good agreement with trimuon data is found, with masses 7 GeV for and 2-4 GeV for . The information contained in experimental distributions of multilepton events is explored. Azimuth-momentum correlations exclude a hadron-vertex origin for the extra muons in and in some events. The two undetected decay neutrinos carry off missing energy equal to 35% of the visible energy on the average; this prediction can be tested with narrow-band beams. The cascade mechanism gives rise to and events at about five times the rate. The observed trimuon rate may require a mixing of with comparable to the Cabibbo angle, which strains conventional universality limits. A generalized mixing scheme which circumvents these limits and allows large coupling is presented.
Keywords
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