Search

Abstract We consider an extension of the Standard Model of particle physics with an additional SU(2) gauge sector along with an additional scalar bidoublet and a non-linear sigma field. The neutral components of the bidoublet serve as dark matter candidates by virtue of the bidoublet being odd under a $$Z_2$$ Z 2 symmetry. Generic beyond Standard Model constraints like vacuum stability, invisible decay of Higgs, Higgs alignment limit and collider constraints on heavy gauge bosons restrict the parameter space of this model. In this multicomponent dark matter scenario, we investigate the interplay between the annihilation and co-annihilation channels originating from the new gauge sector as those contribute to the relic abundance. We also inspect the direct detection constraints on scattering cross-sections of the dark matter particles with the detector nucleons and present our observations.

Abstract In this paper, we explore the collider phenomenology of charged Higgs bosons in the context of a generic Beyond Standard Model scenario with extended gauge and scalar sectors. In such scenarios, the charged Higgs boson can decay via the $$W^{'}Z/ WZ^{'}$$ W ′ Z / W Z ′ channels. We formulate a search strategy for the $$H^{\pm }$$ H ± in the channel $$\sigma (g b \rightarrow H^{\pm }t){\mathcal{B}\mathcal{R}}(H^{\pm } \rightarrow W' Z)$$ σ ( g b → H ± t ) B R ( H ± → W ′ Z ) considering the interesting cascade decay chain $$H^{\pm } \rightarrow W^{'} Z \rightarrow W^{\pm } Z Z$$ H ± → W ′ Z → W ± Z Z . We find that the charged Higgs can be discovered in final states with multiple hard leptons and/or b-quarks which future LHC experiments with sufficiently large luminosity ( $${\mathcal {L}} = 1000~\text {fb}^{-1}$$ L = 1000 fb - 1 and above) can probe. We then study the phenomenological implications of our findings in the context of a generic toy model with a $$H^{\pm }$$ H ± as well as in a more realistic electroweak symmetry breaking scenario.

Abstract We discuss the structure of a model with an extended gauge symmetry group $$SU(2)\times SU(2)\times U(1)$$ S U ( 2 ) × S U ( 2 ) × U ( 1 ) with a correspondingly rich Electroweak Symmetry Breaking structure. In spite of the additional scalar degrees of freedom in the model, the presence of the extra gauge group SU(2) and its associated heavy vector bosons ensures that the scalar spectrum of the model after symmetry breaking is identical to that of the Two Higgs Doublet Models. We construct the model and discuss its implications, specifically the phenomenology associated with this class of models in contrast to the 2HDM.