Study of a0(980)-f0(980) mixing at BES III and study of charged kappa at BES II

TL;DR

This paper reports recent experimental results from BES experiments on light scalar mesons, including the observation of charged kappa and direct measurements of a0(980)-f0(980) mixing, enhancing understanding of scalar meson properties.

Contribution

The study provides new experimental evidence of charged kappa and direct measurements of a0(980)-f0(980) mixing using large J/psi and psi' datasets at BES II and BES III.

Findings

Observation of charged kappa decaying to K pi0 with 5.8×10^7 J/psi data.

Direct measurement of a0(980)-f0(980) mixing in specific decay channels.

Enhanced understanding of light scalar meson mixing and decay properties.

Abstract

Recent BES results on light scalars are reported in this talk, including the observation of a charged kappa decaying to K pi0 with 5.8 * 10^7 J/psi data at BES II and the direct measurements of a0(980)-f0(980) mixing in the processes J/psi --> phi f0(980) --> phi a0(980) --> phi eta pi0 and chi_c1 --> pi0 a0(980) --> pi0 f0(980) --> pi0 pi+ pi- with 2.26 * 10^8 J/psi data and 1.06 * 10^8 psi' data at BES III.