Perturbative unitarity constraints on general W' models and collider implications

Abstract

We study perturbative unitarity constraints on general W' models by considering the high energy behavior of fermion scattering into gauge bosons. In most cases we survey, a Z' boson with a comparable mass must be present for the theory to be consistent, with fixed couplings to the standard model gauge bosons and fermions. Applying these results to a class of W' models which explains the top quark forward-backward asymmetry observed at the Tevatron, we find that a Z' must exist with a mass below 7-8 TeV and sizable coupling to the light quarks. While such a Z' is strongly constrained by existing experiments, we show that the LHC can explore the entire mass range up to the unitarity limit. We also show how it is possible, by raising the Z' mass consistent with unitarity, to explain the CDF Wjj excess in terms of a light W', without generating an excess in Zjj events.

23 pages, 8 figures

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• A reappraisal of constraints on $Z^{\prime }$ models from unitarity and direct searches at the LHC
• On Mono-W Signatures in Spin-1 Simplified Models
• Top A_FB at the Tevatron vs. charge asymmetry at the LHC in chiral U(1) flavor models with flavored Higgs doublets
• Probing topcolor-assisted technicolor from top charge asymmetry and triple-top production at the LHC
• Same-sign Tops: A Powerful Diagnostic Test for Models of New Physics
• How heavy can dark matter be? Constraining colourful unitarity with SARAH
• The Z Penguin in Generic Extensions of the Standard Model
• Charged-current non-standard neutrino interactions at the LHC and HL-LHC
• Probing the Dark Matter of Three-loop Radiative Neutrino Mass Generation Model with the Cherenkov Telescope Array
• Associated production of the heavy charged gauge boson $W_H$ and a top quark at LHC