New results on the hadronic vacuum polarization to the muon g-2

TL;DR

This paper updates the calculation of the hadronic vacuum polarization contribution to the muon g-2 using recent experimental data, revealing a persistent 3 sigma discrepancy with the Standard Model prediction.

Contribution

It incorporates the latest tau decay and e+ e- annihilation data with improved isospin-breaking corrections, enhancing the precision of the muon g-2 theoretical estimate.

Findings

Improved consistency among different experimental results.

Persistent 3 sigma discrepancy with the Standard Model.

Updated hadronic vacuum polarization contribution value.

Abstract

Results on the lowest-order hadronic vacuum polarization contribution to the muon magnetic anomaly are presented. They are based on the latest published experimental data used as input to the dispersion integral. Thus recent results on tau to nutau pi pi0 decays from Belle and on e+ e- annihilation to pi+ pi- from BABAR and KLOE are included. The new data, together with improved isospin-breaking corrections for tau decays, result into a much better consistency among the different results. A discrepancy between the Standard Model prediction and the direct g-2 measurement is found at the level of 3 sigma.