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Title: Multiquark resonances

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. Lastly, 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.
Authors:
 [1] ;  [2] ; ORCiD logo [3]
  1. Columbia Univ., New York, NY (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. "Sapienza" Univ. di Roma, Roma (Italy); CERN, Geneva (Switzerland)
Publication Date:
OSTI Identifier:
1345496
Report Number(s):
JLAB-THY-16-2301; DOE/OR/23177-3888; arXiv:1611.07920
Journal ID: ISSN 0370-1573; PII: S037015731630391X; TRN: US1701186
Grant/Contract Number:
AC05-06OR23177; FG02-11ER41743
Type:
Accepted Manuscript
Journal Name:
Physics Reports
Additional Journal Information:
Journal Volume: 668; Journal Issue: C; Journal ID: ISSN 0370-1573
Publisher:
Elsevier
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; tetraquarks; pentaquarks; exotic hadron resonances