Speaker
Description
We have investigated the hidden-charm strong decays of the exotic charmonium-like state $Y(4230)$ [1] and the spin-2 partner $X2(4014)$ of the charmonium-like state $X(3872)$ [2], recently reported by the BES-III and BELLE collaborations. The exotic states $Y$ and $X2$ have been interpreted as four-quark states with molecular-type interpolating currents in the framework of the covariant confined quark model. We evaluate the hidden-charm decay width of $Y$ into a vector and a scalar, with the latter decaying subsequently to a pair of charged pseudoscalar states. The strong decay mode $Y\to\pi^{+} \pi^{-}$ has been studied by involving the both scalar resonances $f_0(500)$ and $f_0(980)$, considered quark-antiquark states, while the mode $Y \to K^{+} K^{-}$ - via $f_0(980)$. We have calculated the partial widths of the related strong decays and the branching ratio ${\it B}(Y \to K^{+} K^{-}) / {\it B}(Y \to \pi^{+} \pi^{-})$, recently determined by the BES-III Collaboration. The estimated branching ratio and calculated partial strong decay widths are in reasonable agreement with the latest experimental data [1]. We have also considered the decay widths of $X_2$ on the level of two-petal quark loops. The partial widths of the strong decays $X_2\!\to\!\omega \, J/\Psi$ and $X_2\!\to\!\rho^0 \, J/\Psi$ have been calculated and the related branching ratio has been analyzed. In the comparison of our approach to the recent $D^{*} \, \bar{D}^{*}$ molecular scenario, we have shown the explicit appearance of the threshold effect in the latter models [2]. Our theoretical results might be checked by future experiments.
[1]. Gurjav Ganbold and M. A. Ivanov,
Strong decays of charmonium-like state $Y(4230)$,
Eur. Phys. J. A {\bf 60:13} (2024).
[2]. Gurjav Ganbold and M. A. Ivanov,
Hidden-charm strong decays of the spin-2 partner of $X(3872)$,
Phys. Rev. D {\bf 111}, 014007 (2025).
