Abstract
Models with extra gauge symmetry are well-motivated extensions of the Standard Model. In this paper, we study an extended gauge model with a heavy neutral gauge boson $Z'$ which is fermiophobic. Thus, the production of such particles can occur via vector boson fusion, with subsequent decays into $WW$ or $Zh$. We investigate the collider phenomenology of such $Z'$s in the context of both the 14 TeV LHC and the future CLIC. We find that looking at $\ell\ell b b$ final states provides a rich opportunity to discover such new vector bosons where conventional search strategies in the dilepton channel would fail. In particular, we optimize our analysis by putting in kinematic cuts deriving model-independent values of $\sigma\times$BR needed for a 5$\sigma$ discovery at the LHC. We then translate this into the parameter space of a specific model for illustration purpose -- our results show that fermiophobic $Z'$s are discoverable in the $\ell\ell b b$ channel for wide range of parameter values.
Highlights
One of the primary goals in particle physics is to understand the precise mechanism responsible for Electroweak Symmetry Breaking (EWSB)
We translate this into the parameter space of a specific model for illustration purpose—our results show that fermiophobic Z0s are discoverable in the llbb channel for a wide range of parameter values
Many models fall under more than one category. Given this proliferation in the model building scene, it is important for theorists and phenomenologists alike to look for common cues in many of these scenarios—this serves to both discover new physics at the LHC and to look for distinguishing features that would help the inverse program of mapping from a potential future discovery to the space of models
Summary
One of the primary goals in particle physics is to understand the precise mechanism responsible for Electroweak Symmetry Breaking (EWSB). Using the idea of “dimensional deconstruction” [14], these extra dimensional gauge theories could be understood as a collection of 4D gauge groups connected together by nonlinear sigma model fields. The discovery of a Higgs boson necessarily implies that purely Higgsless models cannot be the whole story. Site model introducing two Higgs doublets to break the gauge symmetries This model shares many of the features pertaining to EWSB with other SUð2Þ × SUð2Þ × Uð1Þ models (which we will call 221 Model )—in addition it has certain distinguishing features in that the W0, Z0 in this model are fermiophobic resulting in markedly new ways of production and detection compared to other 221 models.
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