Explaining Atomki anomaly and muon $g-2$ in $U(1)_X$ extended flavour violating two Higgs doublet model

TL;DR

This paper proposes a two Higgs doublet model with an additional $U(1)_X$ gauge symmetry that explains the Atomki anomaly and muon $g-2$ discrepancy through new gauge interactions and scalar particles.

Contribution

It introduces a novel $U(1)_X$ extended two Higgs doublet model that links the Atomki anomaly and muon $g-2$ within a unified framework.

Findings

Light scalar boson around 10 GeV mass compatible with Atomki anomaly.

Parameter space consistent with muon $g-2$ and lepton flavor violation constraints.

Predictions for scalar sector signatures in collider experiments.

Abstract

We investigate a two Higgs doublet model with extra flavour depending $U(1)_X$ gauge symmetry where $Z'$ boson interactions can explain the Atomki anomaly by choosing appropriate charge assignment for the SM fermions. For parameter region explaining the Atomki anomaly we obtain light scalar boson with $\mathcal{O}(10)$ GeV mass, and we explore scalar sector to search for allowed parameter space. We then discuss anomalous magnetic dipole moment of muon and lepton flavour violating processes induced by Yukawa couplings of our model.