Charged Higgs Discovery in the W plus "Dark" Vector Boson Decay Mode

Abstract

In Two Higgs doublet extensions of the Standard Model, flavor-changing neutral current constraints can be addressed by introducing a U(1)' gauge symmetry, under which the Higgs doublets carry different charges. That scenario implies the presence of a H^\pm W^\mp Z' vertex at tree level. For the light "dark" Z model (Z'=Z_d) with m_{Z_d} < 10 GeV, such a coupling leads to the dominant decay mode H^\pm \to W^\pm + Z_d (for m_{H^\pm} \lsim 175 GeV), rather than the usual type I model decay H^\pm \to τ^\pm ν, for a broad range of parameters. We find that current analyses do not place significant bounds on this scenario. Over much of the parameter space considered, the decay of a pair-produced t ({\bar t}) into H^+ b (H^- {\bar b}) provides the dominant H^\pm production. Analysis of available LHC data can likely cover significant ranges of our parameters, if Z_d \to μ^+μ^- has a branching ratio of \sim 20%. If the Z_d decays mainly invisibly then probing the entire relevant parameter space would likely require additional data from future LHC runs. We briefly discuss the phenomenology for m_{H^\pm}\gsim 175 GeV.

5 pages. New material on production of the charged Higgs in t tbar and in association with a top quark, as well as some references, added

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• Searching for new physics effects in future $W$ mass and ${\sin }^2{\theta }_W(Q^2)$ determinations
• Tree-level Unitarity in SU(2)${}_L\times$U(1)${}_Y\times$U(1)${}_{Y^{\prime }}$ Models
• Parity Violation by a Dark Gauge Boson
• Dark Z-mediated dark matter with verifiable exotic scalars
• Charged Higgs Probes of Dark Bosons at the LHC
• Oblique corrections in general dark $U(1)$ models