2007/07/31 by C. Hanhart, Christoph Hanhart, Bastian Kubis +2 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevd.76.074028
published as Phys.Rev.D76:074028,2007 · 15 pages, 9 figures; discussion extended, title changed, version published in Phys. Rev. D
openalex publication_date 2007/10/19 · arxiv created 2007/10/24 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
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 qq states. Amongst the possible experimental signals, we discuss observable consequences for the reaction J/\ensuremathΨ\ensuremath→\ensuremathφ\ensuremathπ0\ensuremathη 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.