Investigation of a0-f0 mixing

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.

15 pages, 9 figures; discussion extended, title changed, version published in Phys. Rev. D

References in corpus (4)

• Nature of the f_0(600) from its N_c dependence at two loops in unitarized Chiral Perturbation Theory
• Two-photon decays of hadronic molecules
• Possibility of measuring a0(980)-f0(980) mixing from J/psi -> phi a0
• Improved Analysis of J/psi Decays into a Vector Meson and Two Pseudoscalars

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