Tetraquarks, pentaquarks and dibaryons in the large N QCD

Maiani, Luciano (Aff1, 0000 0004 0368 8293, grid.16821.3c, T. D. Lee Institute, Shanghai Jiao Tong University, 200240, Shanghai, China) (Aff2, grid.7841.a, Dipartimento di Fisica and INFN, Sapienza Università di Roma, Piazzale Aldo Moro 2, 00185, Rome, Italy) ; Riquer, Veronica (Aff1, 0000 0004 0368 8293, grid.16821.3c, T. D. Lee Institute, Shanghai Jiao Tong University, 200240, Shanghai, China) (Aff2, grid.7841.a, Dipartimento di Fisica and INFN, Sapienza Università di Roma, Piazzale Aldo Moro 2, 00185, Rome, Italy) ; Wang, Wei (Aff3, 0000 0004 0368 8293, grid.16821.3c, INPAC, SKLPPC, MOE Key Laboratory for Particle Physics, School of Physics and Astronomy, Shanghai Jiao Tong University, 200240, Shanghai, China)

13 December 2018

Abstract: We study the multiquark hadrons in large N QCD under the ’t-Hooft limit, extending Witten’s picture of the baryons. We explore the decay widths of tetraquarks, pentaquarks and dibaryons. Based on the decay behaviors, we point out that in the N→∞ limit decay widths of tetraquarks stay constant, while those of pentaquarks and dibaryons above certain thresholds can diverge. In the large N limit, we find that the ground states of the three spectroscopic series are stable or narrow and that the excited states of pentaquarks and dibaryons above the indicated thresholds are not observables. We compare our results with those obtained in previous large N generalizations of tetraquarks.


Published in: EPJC 78 (2018) 1011
Published by: Springer/Società Italiana di Fisica
DOI: 10.1140/epjc/s10052-018-6486-5
License: CC-BY-3.0



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