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 performed a generic scan on this model, allowing all parameters to float. We applied all current theoretical and experimental constraints, including bounds from current searches, recent results from B-physics, in particular Bs→Xsγ, as well as bounds from astroparticle physics. We identify regions in the parameter space which are still allowed after these were applied and which might be interesting for an investigation of current and future collider machines.
Highlights
After the discovery of a scalar boson that complies with predictions of the Standard Model (SM) Higgs boson by the LHC experiments, the quest for additional particles that stem from possible further extensions of the SM scalar sector is an important task for the experimental collaborations
Note that the fit for B → Xs γ implies a lower bound on mH± of ∼800 GeV
We for the first time presented a scan for the THDMa that lets all 12 free parameters of that model float freely within ranges that were chosen to optimize scan performance
Summary
After the discovery of a scalar boson that complies with predictions of the Standard Model (SM) Higgs boson by the LHC experiments, the quest for additional particles that stem from possible further extensions of the SM scalar sector is an important task for the experimental collaborations. We concentrated on the model which has been proposed in [1–5] It extends the scalar sector of the Standard Model by an additional doublet as well as a pseudoscalar singlet, which in turn couples to a fermionic dark matter candidate. The model extends the scalar sector by five additional particles, which we label H, A, a, H± in the mass eigenbasis, as well as a fermionic dark matter candidate χ. Reference [6] contains a detailed discussion as well as benchmark recommendations for the LHC experimental collaborations; these can be seen in refs [7–15] which performed more recent work on this model.
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