Abstract
Current interpretations of the LHC results on two Higgs doublet models (2HDM) underestimate the sensitivity due to neglecting higher order effects. In this work, we revisit the impact of these effects using the current cross-section times branching ratio limits of the Arightarrow hZ, H rightarrow VV and Hrightarrow hh channels. With a degenerate heavy Higgs mass m_varPhi , we find that the LHC searches gain sensitivity to the small tan beta region after including loop corrections, even close to cos (beta -alpha )=0 which is not reachable at tree level for all types of 2HDM. For a benchmark point with m_varPhi =300 GeV, tan beta <1.8(1.2) can be probed for the Type-I(II) 2HDM model for cos (beta -alpha )=0. When the deviation from cos (beta -alpha )=0 is larger, the region for which current searches have exclusion potential becomes larger.
Highlights
Introduction and motivationThe discovery of a Standard Model (SM)-like Higgs boson at the Large Hadron Collider (LHC) [1,2] strongly informs LHC searches for physics beyond-the-SM (BSM), especially for an expanded Higgs sector
Our study shows that the searches in these channels are sensitive to small tan β values even for cos(β − α) = 0 which is unconstrained at tree level, and we present the updated limits on the parameters of two Higgs doublet models for degenerate heavy Higgs masses
As shown in Eqs. (8), and (9), the tree-level H V V couplings are only proportional to cos(β − α), and they are independent of the 2HDM model type
Summary
The discovery of a Standard Model (SM)-like Higgs boson at the Large Hadron Collider (LHC) [1,2] strongly informs LHC searches for physics beyond-the-SM (BSM), especially for an expanded Higgs sector. Motivations for an extension of the SM arise from both theoretical and observational considerations [3]. 2, we give a brief introduction to 2HDMs, summarizing the experimental and theoretical results for the four decay channels described above, with the detailed formulae at one-loop level given in Appendix A. We present our individual channel analyses as well as the combined results in Sect. 3. we give our main conclusions in Sect.
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