Probing Lepton Flavor Violation at Linear Electron-Positron Colliders

Wolfgang Altmannshofer; Pankaj Munbodh

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arXiv · 2505.11653

Probing Lepton Flavor Violation at Linear Electron-Positron Colliders

Wolfgang Altmannshofer·Pankaj Munbodh

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Abstract

The production of $\tau\mu$ pairs in electron-positron collisions offers a powerful probe of lepton flavor violation. In this work, we calculate the $e^+ e^- \to \tau \mu$ cross section within the framework of the Standard Model Effective Field Theory, allowing for arbitrary $e^+e^-$ beam polarizations. We then estimate the sensitivities of proposed future linear colliders, ILC and CLIC, to effective lepton flavor-violating interactions. The high center-of-mass energies achievable at these machines provide particularly strong sensitivity to four-fermion operators. Furthermore, the polarization of the $e^+e^-$ beams enables novel tests of the chirality structure of these interactions. We find that our projected sensitivities not only complement but in certain scenarios surpass those achievable with low-energy tau decay measurements at Belle~II.

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Wolfgang Altmannshofer, Pankaj Munbodh. 2025-05-16. Probing Lepton Flavor Violation at Linear Electron-Positron Colliders. https://arxiv.org/abs/2505.11653

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