Review the hidden-charm pentaquark and tetraquark states was published on the latest international physical authoritative journal Physics Reports by Pro. Liu Xiang, School of Physical Science and Technology, Lanzhou University, Pro. Zhu Shilin of Peiking University, Associate Professor Chen Huaxing of Beihang University and Pro. Chen Wei of University of Saskatchewan .
Here is the abstract of this review:
In the past decade many charmonium-like states were observed experimentally. Especially those charged charmonium-like Zc states and bottomonium-like Zb states cannot be accommodated within the naive quark model. These charged Zc states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.
(Translated by Chen Yan, proofread by Zhu YanLin)
