Light new physics and the τ lepton dipole moments

Testing New-Physics (NP) scenarios that couple predominantly to the third generation is notoriously difficult experimentally, as exemplified by comparing limits for the $\tau$ lepton dipole moments to those of electrons and muons. In this case, extracting limits from processes such as $e^+e^-\to\tau^+\tau^-$ often relies on effective-field-theory (EFT) arguments, which allow for model-independent statements, but only apply if the NP scale is sufficiently large compared to the center-of-mass energy. In this work we offer a comprehensive analysis of light NP contributions to the $\tau$ dipole moments, providing a detailed account of the interpretation of asymmetry measurements in $e^+e^-\to\tau^+\tau^-$ that are tailored towards the extraction of dipole moments, for the test cases of new light spin-$0$ and spin-$1$ bosons. Moreover, we study the decoupling to the EFT limit in these scenarios and discuss the complementarity to constraints from other related processes, such as production in $e^+e^-$ reactions. While covering a wide range of light NP scenarios, as specific case study we present a detailed discussion of a tauphilic gauge vector boson at Belle II.