Implications of recent $\left(g-2\right)_{\mu}$ measurements for MeV-GeV dark sector searches

TL;DR

Recent muon g-2 measurements align with the Standard Model, enabling tighter constraints on MeV-GeV dark sector mediators, surpassing previous collider limits in many cases.

Contribution

This work provides updated bounds on MeV-GeV dark sector mediators using recent muon g-2 data, improving upon previous collider constraints across various mediator types.

Findings

New bounds are comparable or more stringent than previous collider limits.

Constraints are especially tight for scalar, pseudoscalar, vector, and axial vector mediators.

Results apply to both current data and near-future experimental projections.

Abstract

Recent theoretical and experimental studies of the muon magnetic moment indicate the absence of the previously reported discrepancy, providing a vital opportunity to constrain potential BSM physics. In this work, we explore the MeV-GeV mass range, where existing exclusion limits remain relatively loose. We analyze both scalar and pseudoscalar as well as vector and axial vector mediators. We demonstrate that the new bounds are not only comparable to - but in several cases, significantly more stringent than - the constraints obtained from previous collider experiments, even when near-future projections are considered.