A Stueckelberg Extension of the Standard Model
Abstract
An extension of the standard model of electro-weak interactions by an extra abelian gauge boson is given, in which the extra gauge boson and the hypercharge gauge boson both couple to an axionic scalar in a form that leads to a Stueckelberg mass term. The theory leads to a massive Z' whose couplings to fermions are uniquely determined and suppressed by small mixing angles. Such a Z' could have low mass and appear in e+e- collisions as a sharp resonance. The branching ratios into f f species, and the forward-backward asymmetry are found to have distinctive features. The model also predicts a new unit of electric charge e'=Q'e, where Q' is in general irrational, in the coupling of the photon with hidden matter that is neutral under SU(2)L× U(1)Y.
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