BESIII reports the first observation of the exotic π₁(1600) state in χ_c1 decays from ψ(2S) with >21σ significance, measuring mass 1828 MeV/c², width 638 MeV, and product branching fraction 4.30×10^{-4}.
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A constituent quark model predicts masses of 1.9, 4.2, and 6.6 GeV for light, charmonium-like, and fully-charm 1^{-+} tetraquarks along with decay ratios for specific two-body channels and rules out η1(1855) as a compact tetraquark.
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Observation of the Exotic State $\pi_{1}(1600)$ in $\psi(2S)\rightarrow\gamma\chi_{c1},\chi_{c1}\rightarrow\pi^{+}\pi^{-}\eta'$
BESIII reports the first observation of the exotic π₁(1600) state in χ_c1 decays from ψ(2S) with >21σ significance, measuring mass 1828 MeV/c², width 638 MeV, and product branching fraction 4.30×10^{-4}.
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Systematic study of exotic $1^{-+}$ tetraquark spectroscopy
A constituent quark model predicts masses of 1.9, 4.2, and 6.6 GeV for light, charmonium-like, and fully-charm 1^{-+} tetraquarks along with decay ratios for specific two-body channels and rules out η1(1855) as a compact tetraquark.