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

✍ Scribed by Stephan Narison

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 387 KB
• Volume: 121
• Category: Article
• ISSN: 0920-5632
• DOI: 10.1016/s0920-5632(03)01828-0

✦ Synopsis

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 tiu + dd interpretation of the broad and low mass (~(0.6). and the Us resonance nature of the eventually observed n(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 0~ of the o. In a meson-gluonium mixing scenario, one also expects an observation of t,he Kj? final states from the 0s which may compete (if phase space allowed) with the one from a low mass 3s state assumed in the literature t,o be the SU(3) partner of the g(O.6) if this latter is a ??u i-zd stat,e.