Type-III two Higgs doublet model plus a pseudoscalar confronted with $h\rightarrow\mu\tau$, muon $g-2$ and dark matter

TL;DR

This paper proposes an extended Type-III two Higgs doublet model with a pseudoscalar to simultaneously address the muon g-2 anomaly, h→μτ excess, dark matter relic abundance, and the Galactic Center gamma-ray excess, fitting multiple experimental data.

Contribution

It introduces a light pseudoscalar into the Type-III 2HDM, providing a unified explanation for several particle physics and cosmological anomalies within a consistent parameter space.

Findings

Explains h→μτ excess and muon g-2 anomaly simultaneously.

Accounts for dark matter relic abundance.

Proposes dark matter annihilation via pseudoscalar mediators to explain GCE.

Abstract

In this work, we introduce an extra singlet pseudoscalar into the Type-III two Higgs doublet model (2HDM) which is supposed to solve a series of problems in the modern particle-cosmology. With existence of a light pseudoscalar, the $h\rightarrow\mu\tau$ excess measured at CMS and as well as the $(g-2)_{\mu}$ anomaly could be simultaneously explained within certain parameter spaces that can also tolerate the data on the flavor-violating processes $\tau\rightarrow\mu\gamma$ and Higgs decay gained at LHC. Within the same parameter spaces, the DM relic abundance is well accounted. Moreover, the recently observed Galactic Center gamma ray excess(GCE) is proposed to realize through dark matter(DM) pair annihilations, and in this work, the scenario of the annihilation being mediated by the pseudoscalar is also addressed.