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Scalar Mesons in QCD ![]() Auteur(s): Narison S.
Conference: QCD 00 8th High-Energy Physics International Conference on Quantum ChromoDynamics (Montpellier, FR, 2000-07-03) Ref Arxiv: hep-ph/0012235 DOI: 10.1016/S0920-5632(01)01137-9 Ref. & Cit.: NASA ADS 35 citations Résumé: We review the analysis of the quark and gluon substructures of the scalar mesons from QCD spectral sum rules and some low-energy theorems applied to the scalar QCD anomaly current. The present data favour equal components of \bar uu+ \bar dd and of gg in the wave functions of the low-mass (below 1 GeV) scalar mesons, which make the wide \sigma and the narrow f_0(980) as \eta'-like particles, which can have strong couplings to meson pairs through OZI violations. A coherent picture of the other I=0 scalar mesons spectra within this mixing scheme is shortly discussed. We also expect the a_0(980) to be the lowest isovector \bar ud state, and the K^*_0(1430) its \bar ds partner. Commentaires: Two-column latex files, 8 pages |