# Sensitivity of future lepton colliders and low-energy experiments to charged lepton flavor violation from bileptons

## TL;DR

This paper evaluates how future lepton colliders and low-energy experiments can detect charged lepton flavor violation caused by bileptons, highlighting their complementary sensitivities and potential to explore new physics beyond the Standard Model.

## Contribution

It introduces a comparative analysis of future collider and low-energy experiment sensitivities to bilepton-induced charged lepton flavor violation, emphasizing their complementary roles in probing new physics.

## Key findings

- Future lepton colliders will complement low-energy experiments in detecting bilepton couplings.
- Upcoming experiments on muonium-antimuonium conversion and tau decays will explore similar parameter spaces.
- Electroweak precision tests and magnetic moment measurements will also probe bilepton effects.

## Abstract

The observation of charged lepton flavor violation is a clear sign of physics beyond the Standard Model (SM). In this work, we investigate the sensitivity of future lepton colliders to charged lepton flavor violation via on-shell production of bileptons, and compare their sensitivity with current constraints and future sensitivities of low-energy experiments. Bileptons couple to two charged leptons with possibly different flavors and are obtained by expanding the general SM gauge invariant Lagrangians with or without lepton number conservation. We find that future lepton colliders will provide complementary sensitivity to the charged-lepton-flavor-violating couplings of bileptons compared with low-energy experiments. The future improvements of muonium-antimuonium conversion, lepton flavor non-universality in leptonic {\tau} decays, electroweak precision observables and the anomalous magnetic moments of charged leptons will also be able to probe similar parameter space.