Speaker
Dr
Meng-Lin Du
(IFIC, Valencia U.)
Description
A coupled-channel approach is applied to the charged tetraquark state $T_{cc}$ recently discovered by the LHCb Collaboration with special attention paid to the three-body dynamics due to the finite life time of the $D^\ast$. The low-energy expansion of the $D^\ast D$ scattering amplitude is performed and the low-energy parameters (the scattering length and the effective range) are extracted. The compositeness parameter of the $T_{cc}$ is found to be close to unity, which implies that the $T_{cc}$ is a hadronic molecule, generated by the interactions in the $D^{\ast +}D^0$ and $D^{\ast 0}D^+$ channels. With help of heavy-quark spin symmetry, an isoscalar $D^\ast D^\ast$ molecular partner of the $T_{cc}$ with $J^P=1^+$ is predicted under the assumption that the $ DD^\ast$-$D^\ast D^\ast $ coupled-channel effects can be neglected.
Primary author
Dr
Meng-Lin Du
(IFIC, Valencia U.)
Co-authors
Prof.
Alexey Nefediev
(P.N. Lebedev Physical Institute of the Russian Academy of Sciences)
Arseniy Filin
(University Bochum)
Prof.
Christoph Hanhart
(Forschungszentrum Juelich)
Prof.
Feng-Kun Guo
(ITP, Chinese Academy of Science)
Prof.
Juan Nieves
(IFIC, Valencia U.)
Prof.
Qian Wang
(South China Normal University,)
Vadim Baru
(University Bochum)
Xiang-Kun Dong
(ITP, Chinese Academy of Science)
