Leptophilic neutral Higgs bosons in two Higgs doublet model at a linear collider

Abstract

This paper addresses the question of observability of neutral Higgs bosons through the leptonic decay in a two Higgs doublet model (2HDM). Both scalar and pseudoscalar Higgs bosons ($H,A$) are considered. The model is set to type IV to enhance the leptonic decay. In such a scenario, a signal production process like $e^{+}{e}^{-}\to A^0{H}^0\to \tau \tau \mu \mu$ or $\mu \mu \tau \tau$ would provide a clear signal on top of the background in a di-muon invariant mass distribution far from the $Z$ boson pole mass. The analysis is based on a $\tau$-id algorithm which preselects events if they have two $\tau$ jets by requiring a hadronic $\tau$ decay. Several benchmark points are defined for the search, requiring a linear collider operating at $\sqrt{s}=$ 0.5 and 1 TeV. It is shown that the signal can be observed on top of the background in all benchmark points at an integrated luminosity of 1000 $f{b}^{-1}$.