https://doi.org/10.1140/epjc/s10052-018-6486-5
Regular Article - Theoretical Physics
Tetraquarks, pentaquarks and dibaryons in the large N QCD
1
T. D. Lee Institute, Shanghai Jiao Tong University, Shanghai, 200240, China
2
Dipartimento di Fisica and INFN, Sapienza Università di Roma, Piazzale Aldo Moro 2, 00185, Rome, Italy
3
INPAC, SKLPPC, MOE Key Laboratory for Particle Physics, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China
* e-mail: wei.wang@sjtu.edu.cn
Received:
7
November
2018
Accepted:
30
November
2018
Published online:
13
December
2018
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 
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.
© The Author(s), 2018
