Measuring Higgs boson associated Lepton Flavour Violation in electron-photon collisions at the ILC

TL;DR

This paper investigates the potential of electron-photon collisions at the ILC to detect lepton flavor violation mediated by Higgs bosons, providing a new way to probe physics beyond the Standard Model.

Contribution

It introduces a novel approach to measure Higgs-mediated lepton flavor violation in electron-photon collisions, considering constraints from current decay data and polarization effects.

Findings

Cross sections can be significantly large under current constraints.

Electron beam polarization can reveal the chirality of LFV couplings.

The method can improve bounds on LFV Higgs couplings.

Abstract

We study the LFV Higgs production processes $e^-\gamma\to\ell^-\phi\;(\ell=\mu,\tau; \phi=H, A)$ as a probe of Higgs mediated LFV couplings at an electron-photon collider, where $H$ and $A$ are extra CP even and odd Higgs bosons, respectively, in the two Higgs doublet model. Under the constraints from the current data of muon and tau rare decay, the cross section can be significantly large. It would improve the experimental upper bounds on the effective LFV coupling constants. In addition, the chirality nature of the LFV Higgs coupling constants can be measured by selecting electron beam polarizations.