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 a 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 .


Originally posted at http://arxiv.org/abs/hep-ph/0402047v2. Preprint of an article published in Physics Letters B, v.586 no.3-4, 2004.


electro-weak interactions, extra abelian gauge boson, extra gauge boson, hypercharge gauge boson, Stueckelberg mass term, high energy physics

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Particles (Nuclear physics), Bosons, Couplings, Fermions



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