Speaker
Description
The data on the charged tetraquark state $T_{cc}^+$ recently discovered by the LHCb Collaboration are analysed in a coupled-channel scheme with the three-body effects included. The finite width of the $D^*$ meson and the one-pion exchange between the $D$ and $D^*$ mesons are taken into account simultaneously and a high-quality fit is built to the line shape in the $DD\pi$ channel. It is argued that the data are consistent with the $T_{cc}^+$ being a hadronic molecule generated by the interactions in the $D^{*+}D^0$ and $D^{*0}D^+$ channels. The low-energy constants of the amplitude are extracted from the fit and the properties of the $T_{cc}^+$ spin partner state residing near the $D^*D^*$ threshold are discussed. Based on Phys.Rev.D 105 (2022) 014024 and Phys.Lett.B 833 (2022) 137290.
| Category | talk |
|---|
