[PDF] Strong decays of charmonium-like state Y(4230)-论文阅读讨论-ReadPaper

摘要

Strong decays of the charmonium-like state $Y(4320)$ have been studied in theframework of the covariant confined quark model. The resonance $Y$ has beeninterpreted as a four-quark state of the molecular type. We evaluate thehidden-charm decay width of $Y$ to a vector and a scalar, with the latterdecaying subsequently to a pair of charged pseudoscalar states. The strongdecay modes $Y \!\to\! \pi^{+}\pi^{-}J/\Psi$ and $Y \!\to\! K^{+}K^{-} J/\Psi$have been studied by involving the scalar resonance state $f_0(980)$. We havecalculated the fractal widths of the related strong decays and the branchingratio ${\cal B}(Y \!\to\! K^{+}K^{-} J/\Psi)$ / ${\cal B}(Y \!\to\!\pi^{+}\pi^{-}J/\Psi)$, recently determined by the BESIII collaboration. Theestimated branching ratio and calculated fractal strong decay widths are ingood agreement with the latest experimental data, favoring the molecularrepresentation of the $Y(4320)$ state.

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