Muon g-2 in a Type-X 2HDM assisted by inert scalars: probing at the LHC

TL;DR

This paper proposes an extended Type-X 2HDM with inert scalars that can explain the muon g-2 anomaly with a heavier pseudoscalar, and explores its detection prospects at the LHC through tau pair plus missing energy signals.

Contribution

It introduces an inert doublet to the Type-X 2HDM, enabling a heavier pseudoscalar to account for muon g-2 via two-loop Barr-Zee contributions.

Findings

The model accommodates a heavier pseudoscalar consistent with muon g-2.

A distinctive tau+ tau- plus missing energy signature is identified for LHC searches.

Potential to probe the scenario at 14 TeV LHC through specific final states.

Abstract

A scenario augmenting the well known Type-X Two-Higgs doublet model (2HDM) with an additional inert doublet is proposed. The Type-X 2HDM is known to offer a solution to the muon $g-2$ anomaly for a light pseudoscalar. We show that the proposed framework can accomodate a heavier pseudoscalar on account of two-loop Barr-Zee (BZ) contributions to muon $g-2$ stemming from the inert doublet. We subsequently explore an interesting $\tau^+\tau^- + $ missing transverse energy signal that can be used to probe the present scenario at the 14 TeV LHC.