Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-01-15
Phys.Lett.B662:424-430,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 2 figures. References added. Presentation improved. Unchanged in substance. To appear in Phys Lett B
Scientific paper
10.1016/j.physletb.2008.03.036
We discuss the effect of the instanton induced, six-fermion effective Lagrangian on the decays of the lightest scalar mesons in the diquark--antidiquark picture. This addition allows for a remarkably good description of light scalar meson decays. The same effective Lagrangian produces a mixing of the lightest scalars with the positive parity q-qbar states. Comparing with previous work where the q-qbar mesons are identified with the nonet at 1200-1700 MeV, we find that the mixing required to fit the mass spectrum is in good agreement with the instanton coupling obtained from light scalar decays. A coherent picture of scalar mesons as a mixture of tetraquark states (dominating in the lightest mesons) and heavy q-qbar states (dominating in the heavier mesons) emerges.
't Hooft Gerard
Isidori Gino
Maiani Luciano
Polosa Antonio Davide
Riquer Veronica
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