 Baryon plus lepton number (source code)

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= Baryon plus lepton number
{title2=$B+L$}

Baryon plus lepton number is the sum of <baryon number> and <lepton number>. It is an accidental classical symmetry of the renormalizable Standard Model but has an $SU(2)_L$ chiral anomaly, so electroweak instantons and sphalerons violate it.

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