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In this article, we take the scalar diquarks as point particles and describethem as basic quantum fields, then introduce the SU(3) color gauge interactionand new vacuum condensates to study the nonet scalar mesons as tetraquarkstates with the QCD sum rules. Comparing with the conventional quark currents,the diquark currents have the outstanding advantage to satisfy the two criteriaof the QCD sum rules more easily.

Analysis of the nonet scalar mesons as tetraquark states with new QCD sum rules