The hidden-charm pentaquark and tetraquark states

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• 作者：Hua-Xing Chen^a ; ^b ; ¹ ; ^{hxchen@buaa.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Wei Chen^c ; ¹ ; ^{wec053@mail.usask.ca" class="auth_mail" title="E-mail the corresponding author} ; Xiang Liu^d ; ^e ; ^{xiangliu@lzu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Shi-Lin Zhu^a ; ^f ; ^g ; ^{zhusl@pku.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Hidden-charm pentaquark ; Hidden-charm tetraquark ; Charmonium-like state ; Charmonium ; Exotic state ; Phenomenological models
• 刊名：Physics Reports
• 出版年：2016
• 出版时间：10 June 2016
• 年：2016
• 卷：639
• 期：Complete
• 页码：1-121
• 全文大小：7565 K

文摘

In the past decade many charmonium-like states were observed experimentally. Especially those charged charmonium-like Z_c$Z_c$ states and bottomonium-like Z_b$Z_b$ states cannot be accommodated within the naive quark model. These charged Z_c$Z_c$ 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.