Abstract
In this paper, we take the point of view that the 0++ nonet mesons below 1 GeV are diquark–antidiquark states , and seek to determine their masses in the framework of the QCD sum rules approach with the interpolating currents constructed from scalar–scalar-type and pseudoscalar–pseudoscalar-type diquark pairs respectively. The numerical results indicate that the 0++ nonet mesons may have two possible diquark–antidiquark substructures.
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