2HDM Neutral Scalars under the LHC

Understand

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.