Analysis the f0(980) and a0(980) mesons as four-quark states with the QCD sum rules

In this article, we take the point of view that the scalar mesons f(0)( 980) and a(0)( 980) are the diquark-antidiquark states ( qq) (3) over bar( (q) over bar(q) over bar)(3), and we devote our attention to the determination of their masses in the framework of the QCD sum rule approach with the interpolating currents constructed from scalar scalar type and pseudoscalar-pseudoscalar type diquark pairs respectively. The numerical results indicate that the scalar mesons f(0)( 980) and a(0)( 980) may have two possible diquark-antidiquark substructures.