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

We revisit the radiative corrections to the \tau^-\to\pi^-\pi^0\nu_\tau(\gamma) τ − → π − π 0 ν τ ( γ ) 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...

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Bibliographic Details
Published inSciPost physics proceedings no. 16; p. 032
Main Authors Miranda Hernández, Jesús Alejandro, Roig, Pablo
Format Journal Article
LanguageEnglish
Published SciPost 15.07.2025
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ISSN2666-4003
2666-4003
DOI10.21468/SciPostPhysProc.16.032

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Summary:We revisit the radiative corrections to the \tau^-\to\pi^-\pi^0\nu_\tau(\gamma) τ − → π − π 0 ν τ ( γ ) 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 ∼ 2.2 σ .
ISSN:2666-4003
2666-4003
DOI:10.21468/SciPostPhysProc.16.032