Sigma, Kappa and fo(980) in E791 and BES II data

TL;DR

This paper analyzes sigma and kappa mesons using data from E791 and BES II, showing their properties align with elastic scattering when considering chiral symmetry effects.

Contribution

It provides a combined analysis of sigma and kappa resonances from different experiments, confirming their consistency with elastic scattering phases.

Findings

Sigma and kappa are confirmed from multiple datasets.

Phase variations match elastic scattering when including Adler zero.

Results support chiral symmetry breaking effects in meson interactions.

Abstract

Both sigma and kappa are well established from E791 data on D->3pi and D->K-pi-pi$ and BES II data on J/Psi->omega-pi-pi and KKpipi. Fits to these data are accurately consistent with pi-pi and Kpi elastic scattering when one allows for the Adler zero which arises from Chiral Symmetry Breaking. The phase variation with mass is also consistent between elastic scattering and production data.