Recent progress on isospin breaking corrections and their impact on the muon g-2 value

TL;DR

This paper reviews recent advances in calculating isospin breaking corrections and their significance for refining the theoretical prediction of the muon g-2 value, especially in reconciling tau and e+e- data.

Contribution

It presents updated isospin breaking correction results and demonstrates their impact on aligning muon g-2 predictions from different experimental data sources.

Findings

Applying corrections reduces discrepancy between tau and e+e- data-based predictions.

Corrections improve the agreement of muon g-2 estimates with experimental measurements.

Enhanced accuracy in hadronic contribution calculations for muon g-2.

Abstract

We describe some recent results on isospin breaking corrections which are of relevance for predictions of the leading order hadronic contribution to the muon anomalous magnetic moment (amuhadLO) when using tau lepton data. When these corrections are applied to the new combined data on the pi^+pi^0 spectral function, the prediction for amuhadLO based on tau lepton data gets closer to the one obtained using e^+e^- data.