lepton number

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lepton number

n
(Atomic Physics) physics a quantum number describing the behaviour of elementary particles, equal to the number of leptons present minus the number of antileptons. It is thought to be conserved in all processes. Symbol: l
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where [N.sup.[alpha].sub.R] and [S.sup.[beta].sub.L] are two SM-singlet heavy neutrinos with the same lepton numbers, [m.sub.N] is the Dirac mass matrix, and [mu] is a small Majorana mass matrix violating the lepton numbers.
After the pioneering discovery of the d = 5 operator [7] within the SM using the SM leptons, SM Higgs doublets, and [DELTA]L = 2 (L = Lepton number) unit of LNV, it turned out that the Seesaw mechanism [8-14] could be the simplest idea to explain the small neutrino mass and flavor mixing where the SM can be extended by the SM-gauge singlet Majorana type RHNs.
Khan), while another focused on having a viable dark matter candidate in a popular model where baryon and lepton numbers are promoted to gauge symmetries ("Z7 Portal Dark Matter in the Minimal B-L Model", by S.
To have a model with the realistic neutrino mixing matrix, we should consider another variant of the form ([v.sub.L], [l.sub.L], [C.sup.c.sub.R]) where [N.sub.R] are three new fermion singlets under SM symmetry with vanishing lepton numbers [110-113].