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arXiv · 2511.14835

Lepton flavor violation in photon-induced electron-muon pairs at the HL-LHC

M. A. Arroyo-Ureña·O. Félix-Beltrán·J. Hernández-Sánchez·C. G. Honorato·S. Rosado-Navarro
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Abstract

We show the outstanding potential of the High-Luminosity LHC (HL-LHC) to discover charged lepton flavor violation (cLFV) via the ultra-peripheral process $\gamma\gamma \to e^\pm\mu^\mp$. Using a gauge-invariant Effective Field Theory (EFT) framework -consistent with the most stringent bounds from radiative decays- we perform a full Monte Carlo analysis with multivariate techniques. Our results show that a $5\sigma$ discovery is achievable with an integrated luminosity of $\mathcal{L}_{\rm int} \gtrsim 2700$ fb$^{-1}$ for favorable benchmark scenarios. This study establishes photon-fusion at the HL-LHC as a powerful probe of cLFV, strongly motivating dedicated searches by the experimental collaborations.

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M. A. Arroyo-Ureña, O. Félix-Beltrán, J. Hernández-Sánchez, C. G. Honorato, S. Rosado-Navarro. 2025-11-18. Lepton flavor violation in photon-induced electron-muon pairs at the HL-LHC. https://arxiv.org/abs/2511.14835

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