2HDM Neutral Scalars under the LHC

Abstract

Two Higgs Doublet Models (2HDM) provide a simple framework for new physics models with an extended Higgs sector. The current LHC results, including both direct searches for additional non-Standard Model (SM) Higgs bosons, as well as precision measurements of the SM-like Higgs couplings, already provide strong constraints on the 2HDM parameter spaces. In this paper, we examine those constraints for the neutral scalars in the Type-I and Type-II 2HDM. In addition to the direct search channels with SM final states: $H/A\to f\bar{f},VV,Vh,hh$, we study in particular the exotic decay channels of $H/A\to AZ/HZ$ once there is a mass hierarchy between the non-SM Higgses. We found that $H/A\to AZ/HZ$ channel has unique sensitivity to the alignment limit region which remains unconstrained by conventional searches and Higgs precision measurements. This mode also extends the reach at intermediate $\tan \beta$ for heavy $m_A$ that are not covered by the other direct searches.

arXiv commentVersion published in JHEP

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