# Radiative corrections to double-Dalitz decays revisited

## TL;DR

This paper provides a comprehensive next-to-leading order QED calculation of radiative corrections to double-Dalitz decays, which are important for understanding meson transition form factors and the muon's anomalous magnetic moment.

## Contribution

It completes the full NLO QED calculation for double-Dalitz decays, improving upon previous approximations and aiding in precise meson form factor extraction.

## Key findings

- Mild differences with previous calculations of radiative corrections.
- Implications for meson transition form factors and muon g-2.
- Extension to $e^+e^- o e^+e^- P$ processes underway.

## Abstract

We revise the radiative corrections to double-Dalitz decays ($P\to\ell\bar{\ell}\ell'\bar{\ell}'$), completing the full next-to-leading order calculation in QED as compared to existing calculations. As a result, we find mild differences with respect to previous studies, that might be relevant for extracting information about the mesons transition form factors. The latter play an important role in determining the hadronic light-by-light contribution to the anomalous magnetic moment of the muon. Finally, we outline an ongoing extension of this work to the $e^+e^-\to e^+e^- P$ processes.