Study of charged Lepton Flavor Violation in electron muon interactions

TL;DR

This paper explores the potential to detect charged Lepton Flavor Violation in electron-muon interactions mediated by a Z' boson, using collider and fixed target experiments, with detailed simulations showing promising sensitivity improvements.

Contribution

It introduces a novel approach to probing cLFV via electron-muon interactions with detailed Monte Carlo simulations and sensitivity analysis, highlighting advantages over existing methods.

Findings

Significant sensitivity to cLFV coupling strength with tau final states.

Potential to probe a specific cLFV coupling combination, lambda_emu * lambda_mumu.

Enhanced detection prospects at electron muon colliders or fixed target experiments.

Abstract

With the improvement of muon acceleration technology, it has received great interest to exploit high-energy muon beams for collision or target experiments. We investigate possible charged Lepton Flavor Violation (cLFV) processes mediated by an extra massive neutral gauge boson Zprime in electron muon interactions, either at a proposed electron muon collider or in a fixed target experiment with high-energy muon beam hitting electrons in the target. Based on Monte Carlo calculations and fast detector simulations, we study in detail our signal and possible backgrounds, giving the sensitivity results of cLFV signals at the 90% confidence level. Compared with current and prospective limits set by other experiments, electron muon interactions demonstrate significant advantages in the cLFV coupling strength sensitivity with tau in the final states. In addition, a special cLFV coupling combination, lambda_emu * lambda_mumu, can also be probed in our proposal.