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arXiv · 2112.04776

Analysis of the pseudoscalar hidden-charm tetraquark states with the QCD sum rules

Zhi-Gang Wang·Qi Xin
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Abstract

In this work, we take all the color-antitriplet diquarks, such as the scalar, pseudoscalar, vector, axialvector and tensor diquarks, as the basic constituents to construct the local pseudoscalar four-quark currents without importing the explicit P-waves to implement the negative-parity, and investigate the mass spectroscopy of the pseudoscalar hidden-charm tetraquark states without strange, with strange and with hidden-strange in the framework of the QCD sum rules in a consistent and comprehensive way. We obtain the lowest mass $4.56\pm0.08\,\rm{GeV}$ for the pseudoscalar tetraquark state with the symbolic quark constituents $c\bar{c}u\bar{d}$, which is much larger than the experimental value $4239\pm18{}^{+45}_{-10}\,\rm{MeV}$ extracted by the LHCb collaboration.

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Zhi-Gang Wang, Qi Xin. 2021-12-09. Analysis of the pseudoscalar hidden-charm tetraquark states with the QCD sum rules. https://doi.org/10.1016/j.nuclphysb.2022.115761

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