τ dipole moments via radiative leptonic τ decays

We propose a new method to probe the magnetic and electric dipole moments of the τ lepton using precise measurements of the differential rates of radiative leptonic τ decays at high-luminosity b factories. possible deviations of these moments from the standard model values are analyzed in an effective lagrangian approach, thus providing model-independent results. analytic expressions for the relevant non-standard contributions to the differential decay rates are presented. earlier proposals to probe the τ dipole moments are examined. a detailed feasibility study of our method is performed in the conditions of the belle and belle ii experiments at the kekb and super-kekb colliders, respectively. this study shows that our approach, applied to the planned full set of belle ii data for radiative leptonic τ decays, has the potential to improve the present experimental bound on the τ anomalous magnetic moment. on the contrary, its foreseen sensitivity is not expected to lower the current experimental limit on the τ electric dipole moment.