QCD sum rule approach for the light scalar mesons as four-quark states

We study the two point-function for the scalar mesons sigma, kappa, integral(0)(980) and a(0)(980) as diquak-antidiquark states. We also study the decays of these mesons into pipi, Kpi and K (K) over bar. We find that the couplings are consistent with existing experimental data. supporting the four-quark structure for the light scalar mesons. (C) 2005 Elsevier B.V. All rights reserved.