Tau data-driven evaluation of the Hadronic Vacuum Polarization [formula omitted

Abstract

Windows in Euclidean time have become a standard tool for comparing lattice QCD and data-driven computations of the hadronic vacuum polarization (HVP) contribution to the muon g−2. Here we review our results, obtained using isospin-rotated τ−→π−π0ντ data instead of e+e−→π+π− measurements, and compare them to other approaches. Consistency of the tau-based and lattice results hints to underestimated uncertainties in the e+e− data. If that is the case, the theory prediction of the muon g−2 would only lie at ≲2.5σ from its measured value.