Speaker
Description
The isospin violation in the strong decays of the spin-2 exotic charmonium-like state $X_2(4014)$ into channels $\omega J/\Psi$ and $\rho^0 J/\Psi$ has been studied within the framework of the covariant confined quark model, designed to eliminate any UV divergences in quark loops. We have interpreted the exotic hadron $X_2$ as a four-quark state with a $D^*\bar{D}^*$ molecular-type interpolating quark current and computed the leading-order strong decay widths at the level of two-petal quark-loop diagrams. The partial widths of the above-mentioned decay modes and their branching ratio recently discussed in literature have been calculated and analyzed [1]. In the comparison of our approach to the recent $D^{*} \, \bar{D}^{*}$ molecular scenarios, we have shown the explicit appearance of the threshold effect in the latter models. The estimated branching ratio and calculated partial strong decay widths are in reasonable agreement with the latest experimental data. Our theoretical results might be checked by future experiments.
[1]. Gurjav Ganbold and M. A. Ivanov,
"Hidden-charm strong decays of the spin-2 partner of $X(3872)$",
Phys. Rev. D 111, 014007 (2025).
