Electron-muon conversion in nuclei and rare decays induced by LFV dark photon

TL;DR

This paper investigates lepton-flavor violation in electron-muon conversion in nuclei and rare meson decays, focusing on the role of a sub-GeV dark photon as a mediator, with implications for current and future experiments.

Contribution

It provides new estimates for LFV processes involving a sub-GeV dark photon and analyzes their impact on experimental searches for rare decays.

Findings

Estimated LFV conversion rates for fixed target experiments.

Analyzed the influence of a sub-GeV dark photon on rare meson decays.

Provided constraints and predictions for future experimental sensitivities.

Abstract

We study lepton-flavor violation (LFV) effects occurring in the $e-\mu$ conversion in nuclei and in the rare radiative decays $\eta(\eta') \to \gamma \mu e$ of the $\eta$ and $\eta'$ mesons with a special impact of the sub-GeV mass vector mediator (dark photon). In the case of the lepton conversion, we make estimates for running and future experiments operating with electron beams at fixed target. Obtained results are implemented in analysis of the LFV decays $\eta(\eta') \to \gamma \mu e$.