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, if observed, it will signal that the total lepton number is not conserved and neutrinos are Majorana particles.
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.
Furthermore, it would prove that total lepton number is not a conserved quantity, suggesting that this new physics could also be the origin of the observed asymmetry between matter and antimatter in the Universe.