Tau EDM at Low Energies

Abstract

Low energy tau pair production, at B factories and on top of the $Υ$ resonances, allows for a detailed investigation on the CP violation at the electromagnetic tau pair production vertex. High statistic available at low energies offers the opportunity for an independent analysis of CP-violation in the $τ$ lepton physics. We show that stringent and independent bounds on the $τ$ electric dipole moment, competitive with the high energy measurements, can be established in low energies experiments.