Dark Two Higgs Doublet Model

Abstract

We perform a detailed study of a specific Two Higgs Doublet Model (2HDM) with a U(1) gauge symmetry, instead of a typical Z2 discrete symmetry, containing a very light gauge boson Z' (GeV scale or below). The Standard Model (SM) fermions do not carry U(1) charges, but induced couplings to the Z' (called the dark Z) are generated through mixing with the SM neutral gauge bosons. Such a light Z' could explain some astrophysical anomalies as well as the muon g-2 deviation, and has been the subject of great experimental interest. We consider the scenario in which the 125 GeV SM-like Higgs (H) is the heavier scalar state, and focus on the lighter neutral state (h) as well as charged Higgs. We analyze the constraints on the model from various experiments and predict novel channels to search for these Higgs scalars at the LHC. In particular, experiments looking for lepton-jets are among potentially important searches.

Version published in Phys. Rev. D

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• Dark photon relic dark matter production through the dark axion portal
• Muon g-2 Anomaly and Dark Leptonic Gauge Boson
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• Searching for new light gauge bosons at $e^{+}{e}^{-}$ colliders
• Explaining Low Energy $\gamma$-ray Excess from the Galactic Centre using a Two Component Dark Matter Model
• Extension of the electrodynamics in the presence of the axion and dark photon
• Dark matter in Inert Doublet Model with one scalar singlet and $U(1{)}_X$ gauge symmetry
• Constraining Non-minimal Dark Sector Scenarios with the COHERENT Neutrino Scattering Data
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• Flavor Imprints on Novel Low Mass Dark Matter
• Dark Z-mediated dark matter with verifiable exotic scalars
• The Dark Z and Charged Higgs Decay
• Constraining portals with displaced Higgs decay searches at the LHC
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• Oblique corrections in general dark $U(1)$ models