Lepto-philic 2-HDM + singlet scalar portal induced fermionic dark matter

TL;DR

This paper proposes a lepto-philic two-Higgs-doublet model with a singlet scalar to simultaneously explain the muon anomalous magnetic moment discrepancy and the dark matter relic abundance, consistent with collider and detection constraints.

Contribution

It introduces a novel lepto-philic 2-HDM model with a light singlet scalar serving as a portal for fermionic dark matter, addressing multiple experimental anomalies.

Findings

Model explains muon g-2 discrepancy within constraints.

Parameter space consistent with dark matter detection experiments.

Light scalar portal successfully accounts for relic abundance.

Abstract

We explore the possibility that the discrepancy in the observed anomalous magnetic moment of the muon $\Delta a _\mu$ and the predicted relic abundance of Dark Matter by Planck data, can be explained in a lepto-philic 2-HDM augmented by a real SM singlet scalar of mass $\sim$ 10-80 GeV. We constrain the model from the observed Higgs Decay width at LHC, LEP searches for low mass exotic scalars and anomalous magnetic moment of an electron $\Delta a_e$. This constrained light singlet scalar serves as a portal for the fermionic Dark Matter, which contributes to the required relic density of the universe. A large region of model parameter space is found to be consistent with the present observations from the Direct and Indirect DM detection experiments.