Investigation of a0-f0 mixing

TL;DR

This paper studies the isospin-violating mixing of the scalar mesons a0(980) and f0(980) using a unitarized chiral approach, highlighting its significance and potential experimental observability.

Contribution

It provides a novel theoretical framework for describing a0-f0 mixing within chiral symmetry and unitarity, emphasizing meson-meson dynamics over q q-bar states.

Findings

a0-f0 mixing is the dominant isospin-breaking effect in the resonance region

The mixing can be experimentally observed in J/Psi -> phi pi0 eta decay

The approach aligns with chiral symmetry and unitarity principles.

Abstract

We investigate the isospin-violating mixing of the light scalar mesons a0(980) and f0(980) within the unitarized chiral approach. Isospin-violating effects are considered to leading order in the quark mass differences and electromagnetism. In this approach both mesons are generated through meson-meson dynamics. Our results provide a description of the mixing phenomenon within a framework consistent with chiral symmetry and unitarity, where these resonances are not predominantly q q-bar states. Amongst the possible experimental signals, we discuss observable consequences for the reaction J/Psi -> phi pi0 eta in detail. In particular we demonstrate that the effect of a0-f0 mixing is by far the most important isospin-breaking effect in the resonance region and can indeed be extracted from experiment.