Current and future constraints on heavy New Physics from $\tau$ weak dipole momentsKošnik, Nejc (Avtor) Polonsky, Zachary (Avtor) Smolkovič, Aleks (Avtor) electroweak precision physicshigher order electroweak calculationselectric dipole momentsStandard Model Effective Field TheoryWe study the weak magnetic and electric dipole moments of the $\tau$ lepton as precision tests of the Standard Model (SM) and probes of heavy New Physics (NP). We present an updated SM prediction for the $\tau$ weak magnetic dipole moment at one loop, including a careful assessment of theoretical uncertainties from electroweak scheme dependence. Working within the SM Effective Field Theory, we derive comprehensive current constraints on the $\tau$ dipole operators from a combination of observables: the $\tau$ weak and electromagnetic dipole moments, high-mass Drell-Yan tails at the LHC, Z partial decay widths, and the electron electric dipole moment. Finally, we assess the prospects of measuring the SM value of the $\tau$ weak magnetic moment at the FCC-ee Tera-Z run, and project the sensitivities of the leading observables to heavy NP at FCC-ee and HL-LHC, incorporating informed assumptions about improvements of systematic uncertainties. We find that the $\tau$ weak dipole moments are already among the leading probes of the $\tau$ dipole operators, and will become increasingly dominant at future colliders.20262026-09-16 12:02:25Članek v reviji187933sl