Abstract
In this article, we assume that there exist the pseudoscalar and molecular states Z1,2 and construct the color singlet-singlet molecule-type interpolating currents to study their masses with the QCD sum rules. In calculations, we consider the contributions of the vacuum condensates up to dimension-10 and use the formula to determine the energy scales of the QCD spectral densities. The numerical results, and , which lie above the and thresholds respectively, indicate that the and are difficult to form bound state molecular states, the Z1,2 are probably resonance states.
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