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New $\tau$-based evaluation of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment

Jesús Alejandro Miranda Hernández, Pablo Roig Garcés

SciPost Phys. Proc. 16, 032 (2025) · published 15 July 2025

Proceedings event

16th International Workshop on Tau Lepton Physics

Abstract

We revisit the radiative corrections to the $\tau^-\to\pi^-\pi^0\nu_\tau(\gamma)$ decays using Resonance Chiral Theory for the structure-dependent part. This channel is the most important one to understand the hadronic vacuum polarization piece of the muon g-2, which dominates the uncertainty of its data-driven prediction in the Standard Model. Using our results, the discrepancy between theory and experiment for this observable is reduced to $\sim2.2\sigma$.


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