QCD sum rule approach for the light scalar mesons as four-quark states
Thiago V. Brito, Fernando S. Navarra, Marina Nielsen, Mirian E. Bracco
Abstract
We study the two point-function for the scalar mesons σ, κ, f0(980) and a0(980) as diquak-antidiquark states. We also study the decays of these mesons into ππ, Kπ and KK. We found that the couplings are consistent with existing experimental data, pointing in favor of the four-quark structure for the light scalar mesons.
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