Scalar mesons in QCD and tests of the gluon content of the sigma
arXiv:hep-ph/0208081 · doi:10.1016/S0920-5632(03)01828-0
Abstract
We summarize the different features of the scalar mesons from QCD spectral sum rule analyses of the two- and three-point functions. The results do not favour the u-bar u + d-bar d interpretation of the broad and low mass sigma (0.6), and the u-bar s resonance nature of the eventually observed kappa(0.9) meson. We also discuss some OZI-violating and classic semileptonic and radiative decay processes which can reveal in a model-independent way the eventual gluon component sigma_B of the sigma. In a meson-gluonium mixing scenario, one also expects an observation of the K K-bar final states from the sigma_B which may compete (if phase space allowed) with the one from a low mass s-bar s state assumed in the literature to be the SU(3) partner of the if this latter is a u-bar u + d-bar d state
References added. Mini-review given at the QCD 02 9th International High-Energy Physics Conference in Quantum ChromoDynamics (Montpellier 2-9th July 2002)
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