Thermal Leptophilic Light Vector Dark Matter with Spinor Mediator and Muon (g-2) Anomaly

TL;DR

This paper explores a leptophilic light vector dark matter model with a spinor mediator, analyzing its compatibility with muon g-2 anomaly, direct detection constraints, and relic density, revealing viable parameter space despite new experimental bounds.

Contribution

It introduces a novel leptophilic vector dark matter model with a spinor mediator and assesses its phenomenology against recent experimental results.

Findings

Light dark matter (0.1-10 GeV) remains viable within the model.

Muon g-2 anomaly constraints significantly restrict the parameter space.

The model satisfies relic density and direct detection bounds.

Abstract

Inspired by the recently new measurement of $(g-2)_{\mu}$ at FermiLab and reported upper bound for electron-dark matter (DM) recoil by the XENON1T collaboration, we revisited phenomenology of a light MeV scale vector dark matter in a leptophilic extension of standard model while a new spinor field plays the role of mediator. A viable parameter space is considered to discuss the possibility of light dark matter relic density as well as anomalous magnetic moment of the muon. We study DM-electron direct detection and cosmological bounds on the parameters space of the model. It is shown that although new bound of $(g-2)_{\mu}$ anomaly greatly confines the parametric space of the model, the thermal light dark matter can exist for $\rm M_{DM}\sim 10^{-1}-10^{1}~\rm GeV$.