Mixing with a small angle between the pseudoscalar glueball and η_c can increase Br(J/ψ → γ X(2370)) well above the pure-glueball value of 2.3(8)×10^{-4}.
Confirmation of the X(1835) and observation of the resonances X(2120) and X(2370) in J/psi->gamma pi^+pi^-eta'
2 Pith papers cite this work. Polarity classification is still indexing.
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abstract
With a sample of (225.2\pm2.8)*10^{6} J/psi events registered in the BESIII detector, J/psi->gamma pi^+ pi^- eta' is studied using two eta' decay modes: eta'->pi^+ pi^- eta and eta' -> gamma rho^0. The X(1835), which was previously observed by BESII, is confirmed with a statistical significance that is larger than 20\sigma. In addition, in the pi^+pi^-eta' invariant mass spectrum, the X(2120) and the X(2370), are observed with statistical significances larger than 7.2\sigma and 6.4\sigma, respectively. For the X(1835), the angular distribution of the radiative photon is consistent with expectations for a pseudoscalar.
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Fully-strange tetraquarks mostly show narrow fall-apart decay widths of O(10) MeV, with X(2300) possibly matching the 1S-wave 1^{+-} state at 2323 MeV and X(2500) the 1P-wave 0^{-+} state at 2481 MeV.
citing papers explorer
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Production Rate of Glueball-like $X(2370)$ in $J/\psi$ Radiative Decay
Mixing with a small angle between the pseudoscalar glueball and η_c can increase Br(J/ψ → γ X(2370)) well above the pure-glueball value of 2.3(8)×10^{-4}.
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Fully-strange tetraquarks: fall-apart decays and experimental candidates
Fully-strange tetraquarks mostly show narrow fall-apart decay widths of O(10) MeV, with X(2300) possibly matching the 1S-wave 1^{+-} state at 2323 MeV and X(2500) the 1P-wave 0^{-+} state at 2481 MeV.