Probing Lepton Flavor Violation at Circular Electron-Positron Colliders

Abstract

Lepton flavor violation is one of the cleanest probes of physics beyond the standard model. In this work, we explore the sensitivity of the process $e^{+}{e}^{-}\to \tau \mu$ to new physics above the TeV scale at the proposed circular electron-positron colliders FCC-ee and CEPC. We compute the $e^{+}{e}^{-}\to \tau \mu$ cross-section in the Standard Model Effective Field Theory and assess the relevant backgrounds. We compare our sensitivity projections to existing and expected constraints from tau decays and $Z$ decays and find that the future electron-positron colliders provide competitive probes of new physics. We highlight the complementarity of searches for resonant $e^{+}{e}^{-}\to Z\to \tau \mu$ production on the $Z$ pole and searches for non-resonant $e^{+}{e}^{-}\to \tau \mu$ at higher center-of-mass energies.

Comments: 32 pages, 7 Figures