How many family-independent, independent U(1)'s, can we gauge?
William A. Ponce, John F. Zapata, Daniel E. Jaramillo.
Abstract
In the context of SU(3)c x SU(2)L x [U(1)]n, SU(3)c x SU(2)L x SU(2)R x [U(1)]n' and SU(3)c x SU(3)L x[U(1)]n'', we analyze the possible values for n, n' and n''. That is, we look for the number of family-independent, independent abelian hypercharges that can be gauged in each one of those models. We find that n=n'=1 for the minimal fermion content, but n can take any value if we add the right-handed neutrino field to each family in the Standard Model.
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