Symmetries of the Standard Model without and with a Right-Handed Neutrino
Abstract
Given the particle content of the standard model without and with a right-handed neutrino, the requirement that all anomalies cancel singles out a set of possible global symmetries which can be gauged. I review this topic and propose a new gauge symmetry B - 3Ltau in the context of the minimal standard model consisting of the usual three families of quarks and leptons plus just one nuR. The many interesting phenomenological consequences of this hypothesis are briefly discussed.
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