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.
Narison,Mini-review on qcd spectral sum rules,Nuclear and Particle Physics Proceedings 258-259(2015) 189
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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.