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Multiquark resonances
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DOI：10.1016/j.physrep.2016.11.002.png)
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摘要
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Multiquark resonances are undoubtedly experimentally observed. The number of states and the amount of details on their properties have been growing over the years. It is very recent the discovery of two pentaquarks and the confirmation of four tetraquarks, two of which had not been observed before. We mainly review the theoretical understanding of this sector of particle physics phenomenology and present some considerations attempting a coherent description of the so called X and Z resonances. The prominent problems plaguing theoretical models, like the absence of selection rules limiting the number of states predicted, motivate new directions in model building. Data are reviewed going through all of the observed resonances with particular attention to their common features and the purpose of providing a starting point to further research. (C) 2016 Elsevier B.V. All rights reserved.
Keyword:
Tetraquarks
Pentaquarks
Exotic hadron resonances
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