Journal
PHYSICS LETTERS B
Volume 662, Issue 5, Pages 424-430Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2008.03.036
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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 (q) over bar states. Comparing with previous work where the q (q) over bar 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 (q) over bar states (dominating in the heavier mesons) emerges. (C) 2008 Published by Elsevier B.V.
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