TY  - JOUR
AU  - Du, Meng-Lin
AU  - Baru, Vadim
AU  - Dong, Xiang-Kun
AU  - Filin, Arseniy
AU  - Guo, Feng-Kun
AU  - Hanhart, Christoph
AU  - Nefediev, Alexey
AU  - Nieves, Juan
AU  - Wang, Qian
TI  - Coupled-channel approach to T c c + including three-body effects
JO  - Physical review / D
VL  - 105
IS  - 1
SN  - 2470-0010
CY  - [S.l.]
PB  - Soc.
M1  - FZJ-2022-01059
SP  - 014024
PY  - 2022
AB  - A coupled-channel approach is applied to the charged tetraquark state T+cc recently discovered by the LHCb Collaboration. The parameters of the interaction are fixed by a fit to the observed line shape in the three-body D0D0π+ channel. Special attention is paid to the three-body dynamics in the T+cc due to the finite life time of the D∗. An approach to the T+cc is argued to be self-consistent only if both manifestations of the three-body dynamics, the pion exchange between the D and D∗ mesons and the finite D∗ width, are taken into account simultaneously to ensure that three-body unitarity is preserved. This is especially important to precisely extract the pole position in the complex energy plane whose imaginary part is very sensitive to the details of the coupled-channel scheme employed. The D0D0 and D0D+ invariant mass distributions, predicted based on this analysis, are in good agreement with the LHCb data. The low-energy expansion of the D∗D scattering amplitude is performed and the low-energy constants (the scattering length and 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*+D0 and D*0D+ channels. Employing heavy-quark spin symmetry, an isoscalar D∗D∗ molecular partner of the T+cc with JP=1+ is predicted under the assumption that the DD∗−D∗D∗ coupled-channel effects can be neglected.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000747425300003
DO  - DOI:10.1103/PhysRevD.105.014024
UR  - https://juser.fz-juelich.de/record/905852
ER  -