$U(1)_{T3R}$ Extension of Standard Model: A Sub-GeV Dark Matter Model

TL;DR

This paper introduces a $U(1)_{T3R}$ extended Standard Model with a sub-GeV dark matter candidate, addressing fermion mass hierarchy and anomalies, and proposes experimental probes at colliders and neutrino facilities.

Contribution

It proposes a novel $U(1)_{T3R}$ extension that explains fermion mass hierarchy, dark matter, and anomalies, with testable predictions at current experiments.

Findings

Models the sub-GeV dark matter and mediators consistent with observed relic abundance.

Explains muon g-2 and $R_{K^{(*)}}$ anomalies within the framework.

Suggests multiple experimental avenues for probing the model.

Abstract

We present a model based on a $U(1)_{T3R}$ extension of the Standard Model. The model addresses the mass hierarchy between the third generation and the first two generation fermions. $U(1)_{T3R}$ is spontaneously broken at $\sim 1-10$ GeV. The model contains a sub-GeV dark matter candidate and two sub-GeV light scalar and vector mediators. The model explains the thermal dark matter abundance, measurements of the muon g-2 and $R_{K^{(\ast)}}$ anomalies. The model can be probed at the LHC, FASER, dark matter experiments and various beam-dump based neutrino facilities, e.g., COHERENT, CCM, MicroBooNE, SBND, ICARUS, DUNE etc.