Multiquark Resonances

By A. Esposito, Alessandro Pilloni, A. Polosa. 2016

769 citations recorded by the source corpus.

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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/ef3f5d139c9d6ea5c0121076cd1e26f855475d73

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In Nuclear and High Energy Physics

1. T. Blake
2. Simone Bifani
3. A. Vidal
4. Vladimir Vava Gligorov
5. C. Hanhart
6. D. Zieminska
7. U. Egede
8. N. Serra

Citations in the corpus

• Physics case for an LHCb Upgrade II - Opportunities in flavour physics, and beyond, in the HL-LHC era (2018, background): “Models binding many quarks in the same confining volume have also been proposed [466,467].”
• The XYZ states: Experimental and theoretical status and perspectives (2019, background): “A comprehensive discussion of further developments of these ideas and their application to the spectrum of the XYZ states can be found in a recent review [499].”
• Hadronic molecules (2017, methodology): “It seems in conflict with the hadronic molecular picture, and was claimed to be consistent with the tetraquark approach (Esposito et al., 2016a).”
• Nonstandard heavy mesons and baryons: Experimental evidence (2017, background): “For this we refer the reader to three recent and comprehensive discussions of these issues by experts who have somewhat different viewpoints (118; 119; 360).”