Measurement of meson transition form factors at BESIII

TL;DR

This paper reports on measurements of meson transition form factors at BESIII, which are crucial for understanding photon-hadron interactions and contribute to precise calculations of the muon's anomalous magnetic moment.

Contribution

It presents new experimental results on pseudoscalar meson transition form factors across various production mechanisms at BESIII.

Findings

Transition form factors measured in Dalitz decays

Form factors studied in radiative production and two-photon scattering

Results contribute to improved theoretical models of photon-hadron interactions

Abstract

Meson transition form factors describe the coupling of photons and hadrons. They are an important input to the calculations of the light-by-light scattering contribution of the anomalous magnetic moment of the muon. At the BESIII experiment in Beijing, the transition form factors of pseudoscalar mesons are studied in their Dalitz decays, in their radiative production in $e^+e^-$ annihilation, and in their production in two-photon scattering. All relevant kinematic regimes are covered. An overview of the recent results and the status of the ongoing analyses is provided.