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15–19 Nov 2021
Institute of High Energy Physics (IHEP), CAS
Asia/Shanghai timezone

Analysis of Tcc including chiral dynamics and three-body cut

Not scheduled
15m
Institute of High Energy Physics (IHEP), CAS

Institute of High Energy Physics (IHEP), CAS

19B Yuquan Road, Shijingshan District, Beijing, China

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)

Presentation materials

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