A revision of radiative corrections to double-Dalitz decays

TL;DR

This paper revisits and completes the calculation of radiative corrections to double-Dalitz decays up to next-to-leading order in QED, highlighting potential implications for meson transition form factors and the muon g-2.

Contribution

It provides a refined and comprehensive calculation of radiative corrections to double-Dalitz decays, improving upon previous studies.

Findings

Mild differences found compared to earlier results.

Corrections are relevant for meson transition form factors.

Implications for the muon anomalous magnetic moment.

Abstract

The radiative corrections to double-Dalitz ($P\to\bar{\ell}\ell\bar{\ell'}\ell'$) decays are revisited and completed up to next-to-leading order in QED, finding mild differences with respect to previous studies. These might be relevant for extracting information about the mesons transition form factors, which play an important role in determining the hadronic light-by-light contribution to the anomalous magnetic moment of the muon.