LOG#063. SM(V): Gauge fixing.

Gauge theories require that we select “a gauge” in order to calculate physical observables. That is, you have to fix the gauge to eliminate field configurations that are physically equivalent ( they can not be distintinguished, as field configurations). The … Continue reading

LOG#062. SM(IV): SSBEW&Higgs.

We have seen that the SM, under general considerations such as gauge invariance and renormalizability, does NOT initially allow EXPLICIT mass terms in the lagrangian framework for the gauge bosons AND/OR the chiral fermions. Note that every SM fermions is … Continue reading

LOG#061. SM (III): EW sector.

The above picture is the EW lagrangian! Is it simple? Is it beautiful? It depends on your taste! It is called the GSW (Glashow-Salam-Weinberg) lagrangian. The electroweak (EW) part/theory is based on the gauge symmetry group. Before spontaneous symmetry breaking, … Continue reading