M. Ozer, THE ELECTROMAGNETIC GAUGE-INVARIANCE IN THE SU(3)(L)XU(1)(X) MODELS OF ELECTROWEAK UNIFICATION, Physics letters. Section B, 337(3-4), 1994, pp. 324-327
We obtain conditions that must be satisfied by the Higgs fields to mai
ntain the electromagnetic gauge invariance in the SU(3)L X U(1)X model
s of electroweak unification. We point out that in some SU(3)L X U(1)X
models, the masslessness of the photon prevents the neutrinos from ac
quiring Majorona masses.