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Lepton flavor violation at FCC-ee and CEPC

Pankaj Munbodh

SciPost Phys. Proc. 17, 006 (2025) · published 23 July 2025

Proceedings event

17th International Workshop on Tau Lepton Physics

Abstract

Lepton flavor violating processes are highly suppressed in the Standard Model. Therefore, if observed, lepton flavor violation would be a clear indication of new physics beyond the Standard Model. We study the process $e^+e^-\to\tau\mu$ at tree-level in the Standard Model Effective Field Theory both on the $Z$-pole and at higher center-of-mass energies. We show that the constraints derived from the future circular $e^+e^-$ colliders FCC-ee and CEPC, are complementary to those obtained from low-energy tau decays at BaBar and Belle, as well as projections from Belle-II.

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