title: Identifying Exotic Hidden-Charm Pentaquarks.
abstract: The LHCb Collaboration at the Large Hadron Collider at CERN discovered two pentaquark states P_{c}(4380) and P_{c}(4450). These two hidden-charm states are interpreted as the loosely bound Σ_{c}(2455)D^{*} and Σ_{c}^{*}(2520)D^{*} molecular states in the boson exchange interaction model, which provides an explanation for why the experimental width of P_{c}(4450) is much narrower than that of P_{c}(4380). The discovery of the new resonances P_{c}(4380) and P_{c}(4450), indeed, opens a new page for hadron physics. The partners of P_{c}(4380) and P_{c}(4450) should be pursued in future experiments.
authors.affiliation: Research Center for Hadron and CSR Physics, Lanzhou University & Institute of Modern Physics of CAS, Lanzhou 730000, China and School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Chen
authors.affiliation: Research Center for Hadron and CSR Physics, Lanzhou University & Institute of Modern Physics of CAS, Lanzhou 730000, China and School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Liu
authors.affiliation: School of Physics, Nankai University, Tianjin 300071, China.
authors.forename: Xue-Qian
authors.initials: XQ
authors.lastname: Li
authors.affiliation: School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China; Collaborative Innovation Center of Quantum Matter, Beijing 100871, China and Center of High Energy Physics, Peking University, Beijing 100871, China.
authors.forename: Shi-Lin
authors.initials: SL
authors.lastname: Zhu