Speaker
Description
The doubly charmed tetraquark $T_{cc}$, reported by the LHCb experiment in 2022, is interpreted as a $DD^\ast$ hadronic molecular state because of its location close to the $D^{\ast +}D^0$ threshold. Motivated by this observation, we analyzed $T_{cc}$ as a $D^{(\ast)}D^{(\ast)}$ molecule using a coupled-channel approach. On the other hand, based on superflavor symmetry, which relates a heavy antiquark to a heavy diquark, the $\bar{D}^{(\ast)}\Xi_{cc}^{(\ast)}$ and $\Xi_{cc}^{(\ast)}\Xi_{cc}^{(\ast)}$ systems are expected as partner states of $T_{cc}$.
We study possible bound and resonant states of $\bar{D}^{(\ast)}\Xi_{cc}^{(\ast)}$ and $\Xi_{cc}^{(\ast)}\Xi_{cc}^{(\ast)}$ using a one-boson-exchange potential with $\pi$, $\rho$, $\omega$, and $\sigma$ exchanges. The model parameters are determined from the $T_{cc}$ system through superflavor symmetry, and the dependence on the poorly known $\sigma$-meson coupling is also investigated.
Our analysis predicts various bound and resonant states of $\bar{D}^{(\ast)}\Xi_{cc}^{(\ast)}$ and $\Xi_{cc}^{(\ast)}\Xi_{cc}^{(\ast)}$. We find that the predicted spectra depend strongly on the $\sigma$-meson coupling and that all the resonant states obtained in our analysis are Feshbach resonances. These results suggest a rich spectrum of exotic hadrons related to $T_{cc}$ and provide possible candidates for future experimental searches.