PeterDonis
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nikkkom said:Where can I see the high energy SM Lagrangian?
See, for example, here:
https://en.wikipedia.org/wiki/Electroweak_interaction#Lagrangian
nikkkom said:A quadratic term of Higgs field is allowed.
As I understand it, it isn't, because before EW symmetry breaking, the Higgs field is not a single scalar field. It's a complex SU(2) doublet, and a direct quadratic mass term would break SU(2) gauge invariance.