Scalar mesons in QCD and tests of the gluon content of the sigma

Details Scalar mesons in QCD and tests of the gluon content of the sigma Scalar mesons in QCD and tests of the gluon content of the sigma

2002-08-08

arxiv.org/abs/hep-ph/0208081v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

References added. Mini-review given at the QCD 02 9th International High-Energy Physics Conference in Quantum ChromoDynamics (

Scientific paper

10.1016/S0920-5632(03)01828-0

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 $\sigma (0.6)$ if this latter is a u-bar u + d-bar d state

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