Comment on "Zc-like spectra from QCD Laplace sum rules at NLO"
Abstract
In Phys. Rev. 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, =1.70 2.35\,GeV. We explore the problems in the operator product expansion, Borel windows, etc, in details.
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