The THDMa revisited

Abstract

The THDMa is a new physics model that extends the scalar sector of the Standard Model by an additional doublet as well as a pseudoscalar singlet and allows for mixing between all possible scalar states. In the gauge-eigenbasis, the additional pseudoscalar serves as a portal to the dark sector, with a priori any dark matter spins states. The option where dark matter is fermionic is currently one of the standard benchmarks for the experimental collaborations, and several searches at the LHC constrain the corresponding parameter space. However, most current studies constrain regions in parameter space by setting all but 2 of the 12 free parameters to fixed values. In this work, we perform a generic scan on this model, allowing all parameters to float. We apply all current theoretical and experimental constraints, including bounds from current searches, recent results from B-physics, in particular B_s -> X_s gamma, as well as bounds from astroparticle physics. We identify regions in the parameter space which are still allowed after these have been applied and which might be interesting for an investigation at current and future collider machines.

30 pages, 8 figures; v2: 33 pages, 8 figures, corresponds to published journal version (slight style differences)

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Cited by in corpus (7)

• The 2HD+a model for a combined explanation of the possible excesses in the CDF ${\mathbf{M}}_{\mathbf{W}}$ measurement and $(\mathbf{g}-2{)}_{\mu }$ with Dark Matter
• Two-Higgs-doublet models in light of current experiments: a brief review
• Collider Searches for Dark Matter through the Higgs Lens
• Exotic Higgs Decays
• Baryogenesis from spontaneous CP violation in the early Universe
• Search for dark matter produced in association with a single top quark and an energetic $W$ boson in $\sqrt{s}=$ 13 TeV $pp$ collisions with the ATLAS detector
• Semi-dark Higgs decays: sweeping the Higgs neutrino floor