Electroweak Limits on General New Vector Bosons

Details Electroweak Limits on General New Vector Bosons Electroweak Limits on General New Vector Bosons

2010-05-21

arxiv.org/abs/1005.3998v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex 50 pages, 12 eps figures. Typos fixed, comments and references added

Scientific paper

We study extensions of the Standard Model with general new vector bosons. The full Standard Model gauge symmetry is used to classify the extra vectors and constrain their couplings. We derive the corresponding effective Lagrangian, valid at energies lower than the mass of the extra vectors, and use it to extract limits from electroweak precision observables, including LEP 2 data. We consider both universal and nonuniversal couplings to fermions. We study the interplay of several extra vectors, which can have the effect of opening new regions in parameter space. In particular, it allows to explain the anomaly in the bottom forward-backward asymmetry with perturbative couplings. Finally, we analyze quantitatively the implications for the Higgs mass.

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