Okay, Lagrangian... I have to study some basics first )
Is it only interaction particles (bosons) which are predicted to be massless or matter particles (fermions) as well?
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Okay, Lagrangian... I have to study some basics first )
Is it only interaction particles (bosons) which are predicted to be massless or matter particles (fermions) as well?
Both in this case. Only a specific class of fermions can be massive, called vector-like fermions (whose two chiralities behave the same), that can be massive. However, there is no such a vector-like fermion in the Standard Model.