lepton number


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Related to lepton number: baryon number

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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Moreover, the intriguing option that neutrinos can be Majorana particles reveals an entirely new aspect of reality in which some of the sacrosanct laws of nature, such as the perturbative conservation of lepton number, can be conspicuously broken.
In the minimal supersymmetric standard model (MSSM), unlike in the SM, the conservation of lepton number (L) and of baryon number (B) is not automatic: the superpotential can contain renormalizable and gauge invariant L- and B-violating terms.