Comment on " $Z_c$ -like spectra from QCD Laplace sum rules at NLO"

preprint2022arXivOpen access

In Phys. Rev. {\bf D103} (2021) 074015 (arXiv:2101.07281), huge (or largest) mass gaps between the ground states and first radial excited states for the tetraquark molecular states are obtained, $Δ=1.70\sim 2.35\,\rm{GeV}$ . We explore the problems in the operator product expansion, Borel windows, etc, in details.

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Comment on " $Z_c$ -like spectra from QCD Laplace sum rules at NLO"

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Comment on "ZcZ_cZc​-like spectra from QCD Laplace sum rules at NLO"

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Comment on " $Z_c$ -like spectra from QCD Laplace sum rules at NLO"