Regular Article - Theoretical Physics
Mass spectrum and strong decays of tetraquark states
Center of High Energy Physics, Peking University, 100871, Beijing, China
2 School of Mathematics and Physics, University of Science and Technology Beijing, 100083, Beijing, China
3 Advanced Science Research Center, Japan Atomic Energy Agency, 319-1195, Tokai, Ibaraki, Japan
4 Nishina Center for Accelerator-Based Science, RIKEN, 351-0198, Wako, Japan
5 School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, 100871, Beijing, China
Accepted: 13 February 2021
Published online: 25 February 2021
We systematically study the mass spectrum and strong decays of the S-wave states in the compact tetraquark scenario with the quark model. The key ingredients of the model are the Coulomb, the linear confinement, and the hyperfine interactions. The hyperfine potential leads to the mixing between different color configurations, and to the large mass splitting between the two ground states with and . We calculate their strong decay amplitudes into the channels with the wave functions from the mass spectrum calculation and the quark-interchange method. We examine the interpretation of the recently observed as a tetraquark state. The mass and decay width of the state are MeV and MeV, respectively, which indicates that it might be a good candidate for . Meanwhile, we also obtain an isospin partner state with MeV and MeV, respectively. Future experimental search for X(2649) will be very helpful.
© The Author(s) 2021
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