NLO QCD sum rules exclude π1(1400) as a tetraquark but find 1^{-+} states near 2 GeV consistent with π1(2015) as a tetraquark candidate.
Wang,Mass spectrum of the hidden-charm hybrid states via qcd sum rules,Phys
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NLO QCD sum rules analysis of $1^{-+}$ tetraquark states
NLO QCD sum rules exclude π1(1400) as a tetraquark but find 1^{-+} states near 2 GeV consistent with π1(2015) as a tetraquark candidate.