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What is the global symmetry of the electroweak Lagrangian that gives rise to lepton number conservation?

As I understand it, electric charge is some linear combination of the conserved quantities corresponding to the SU(2) symmetry and the U(1) symmetry of the electroweak theory. If something similar is true for lepton number, then perhaps it would not be easiest to give the global symmetry directly. This is perfectly fine of course.

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