1994/04/29 by B. Moussallam, J. Stern, Moussallam, B. +1
Chemistry · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Molecular spectroscopy and chirality #Nonlinear Waves and Solitons #Quantum chaos and dynamical systems
paper · pdf · doi:10.48550/arxiv.hep-ph/9404353
openalex publication_date 1994/04/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Electromagnetic decays of the scalar mesons are shown to be constrained by chiral symmetry as a consequence of the fact that, in the chiral limit, the two and three-point functions and satisfy super-convergent dispersion relations. The QCD asymptotic behavior of the latter is canonical and it can be saturated by a finite number of resonances. The corresponding chiral lagrangian for vector and scalar resonances is constructed. Matching to the correct asymptotic structure generates non-minimal terms which have so far been ignored. It is found that the width a0(980)→2γ can be naturally reproduced suggesting that the a0(980) is not an exotic particle.