Volume 135, Number 3, August 2021
|Number of page(s)||7|
|Section||The Physics of Elementary Particles and Fields|
|Published online||24 September 2021|
The exotic hadron states in quenched and unquenched quark models
1 Department of Physics and Jiangsu Key Laboratory for Numerical Simulation of Large Scale Complex Systems, Nanjing Normal University - Nanjing 210023, PRC
Received: 30 July 2021
Accepted: 10 September 2021
In the last two decades, a large number of exotic hadron states have been observed in experiments, which arouses great attention in the hadron physics community. In this short review, we briefly summarize progresses of our group on several exotic hadron states. Two approaches, quenched and unquenched quark models, are adopted in the calculation. The channel coupling effects, the multiquark states couple to open channels and the quark-antiquark states couple to meson-meson states, are emphasized. X(3872) is showed to be a mixture state of and in the unquenched quark model. X(2900) can be explained as a resonance state with the quantum numbers in both the quark delocalization color screening model and the chiral quark model. The reported state X(6900) can be explained as a compact resonance state with in both two quark models, and several fully heavy tetraquark states are predicated. The possible hidden-charm pentaquarks are systematically investigated in QDCSM, and seven resonance states are obtained in the corresponding baryon-meson scattering process, among which the with , with and are consistent with the experimental report of Pc(4312), Pc(4440), and Pc(4457), respectively. More experimental data on exotic hadron states are vital for understanding exotic hadron states in quark models.
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