On the Radiative Pion Decay

TL;DR

This paper reanalyzes the radiative pion decay using chiral perturbation theory, combining theoretical calculations with experimental data to accurately estimate hadronic contributions and determine relevant coupling constants.

Contribution

It provides a comprehensive reanalysis of radiative pion decay, integrating chiral perturbation theory with large-N_C expansion and experimental data for improved accuracy.

Findings

Calculated decay amplitude including Bremsstrahlung and structure-dependent parts

Estimated hadronic contributions with reduced uncertainties

Determined coupling constants from combined theoretical and experimental analysis

Abstract

A reanalysis of the radiative pion decay together with the calculation of the radiative corrections within chiral perturbation theory (CHPT) is performed. The amplitude of this decay contains an inner Bremsstrahlung contribution and a structure-dependent part that are both accessible in experiments. In order to obtain a reliable estimate of the hadronic contributions we combine the CHPT result with a large-N_C expansion and experimental data on other decays, which makes it possible to determine the occurring coupling constants.