lepton number

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lepton number

[′lep‚tän ‚nəm·bər]
(particle physics)
A conserved quantum number, equal to the number of leptons minus the number of antileptons in a system.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Appendix C presents the lepton numbers and lepton parities of model particles.
The particles in the lepton triplet have different lepton numbers (1 and 0), so the lepton number in the model does not commute with the gauge symmetry unlike the SM.
Each lepton family includes a new fermion singlet carrying no lepton number ([N.sub.R]) arranged under the SU[(3).sub.L] symmetry as a triplet ([v.sub.L], [l.sub.L], [N.sup.c.sub.R]) and a singlet [l.sub.R].
To provide the Majorana masses for the neutrinos, the lepton number must be broken.