Electromagnetic Corrections to Low-Energy pi-pi Scattering

TL;DR

This paper reviews electromagnetic corrections to low-energy pi-pi scattering at next-to-leading order, estimating their impact on scattering lengths and comparing with strong interaction effects, enhancing understanding of meson interactions.

Contribution

It provides a detailed analysis of electromagnetic effects on pi-pi scattering amplitudes at next-to-leading order in chiral perturbation theory, which was not comprehensively addressed before.

Findings

Electromagnetic corrections significantly affect scattering lengths.

Comparison shows electromagnetic effects are comparable to two-loop strong interactions.

Results improve precision in low-energy meson scattering predictions.

Abstract

Electromagnetic corrections to the low-energy pi+ pi- -> pi0 pi0 scattering amplitude at next-to-leading order in the chiral expansion are reviewed. Their effects on the corresponding scattering lengths are estimated and compared to the two-loop strong interaction contributions. Contribution to the proceedings of the Eighth International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon, Zuoz, Engadine, Switzerland, August 15-21 1999.