Joint Dalitz decomposition of two e+e- processes with dispersive pi pi / KKbar final-state interactions shows a non-resonant production term is required and extracts Breit-Wigner parameters for Zc(3900), Y(4220), and Y(4320).
Evidence of a Broad Structure at an Invariant Mass of 4.32 GeV/$c^2$ in the Reaction $e^+e^-\to\pi^+\pi^-\psi(2S)$ Measured at BaBar
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abstract
We present a measurement of the cross section of the process $e^+e^-\to\pi^+pi^-\psi(2S)$ from threshold up to 8 GeV center-of-mass energy using events containing initial-state radiation, produced at the PEP-II $e^+e^-$ storage rings. The study is based on 298 fb$^{-1}$ of data recorded with the BaBar detector. A structure is observed in the cross-section not far above threshold, near 4.32 GeV. We also investigate the compatibility of this structure with the Y(4260) previously reported by this experiment.
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UNVERDICTED 2representative citing papers
Constituent quark model with imported meson parameters predicts lowest 1-- P-wave tetraquark mass near 4.15 GeV and proposes that ψ(4230), ψ(4360), ψ(4660), and Υ(10753) may be such states with possible multiples near 4.36 GeV.
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Simultaneous Dalitz-plot decomposition of the $e^+ e^- \to J/\psi \, \pi \, \pi \, (K \bar{K})$ processes in the 4.13-4.36 GeV region using dispersive final-state interactions
Joint Dalitz decomposition of two e+e- processes with dispersive pi pi / KKbar final-state interactions shows a non-resonant production term is required and extracts Breit-Wigner parameters for Zc(3900), Y(4220), and Y(4320).
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Study of $1^{--}$ P wave charmoniumlike and bottomoniumlike tetraquark spectroscopy
Constituent quark model with imported meson parameters predicts lowest 1-- P-wave tetraquark mass near 4.15 GeV and proposes that ψ(4230), ψ(4360), ψ(4660), and Υ(10753) may be such states with possible multiples near 4.36 GeV.