I am trying to understand the concept of anomalies and the global or gauge symmetry breaking, i.e. the Lepton and Baryon number symmetries.(adsbygoogle = window.adsbygoogle || []).push({});

Could someone explain me, what we mean by saying that the Baryon or Lepton U(1) symmetries are broken? and how is that done?

I've seen the loop diagram - eg a current of B or L coming in and annihilating into two U(1)_Y bosons- and how this leads into non trivial current divergence.... But I cannot or didn't see where the factor of energy comes in... (because in low energies, the B,L numbers are "good").

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# Anomalies and Symmetries

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