Flavour-Exotic Tetraquarks in Large-Ν<sub>c</sub> QCD: Do They Exist?
- Author(s)
- Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian
- Abstract
Flavour-exotic tetraquark mesons, by definition bound states of two quarks and two antiquarks of four mutually different quark flavours, are, for given Lorentz features, subject to two incompatible constraints: On the one hand, within quantum chromodynamics a formation of compact tetraquark states is most easily envisaged by merging two colour-antisymmetric two-quark clusters, a diquark and an antidiquark. This path, however, leads to merely a single tetraquark state of chosen Lorentz characteristics. On the other hand, in the limit of the number of colour degrees of freedom growing beyond bounds, internal consistency at leading order calls for the presence of (at least) two of such tetraquark states of identical quark-flavour composition. The failure of attempts to reconcile these two contradictory insights suggests the nonexistence of compact flavour-exotic tetraquark mesons.
- Organisation(s)
- Particle Physics
- External organisation(s)
- Österreichische Akademie der Wissenschaften (ÖAW), Anuchin Research Institute and Museum of Anthropology, Institut de Physique Nucléaire, CNRS-IN2P3
- Journal
- Proceedings of Science (PoS)
- Volume
- 364
- No. of pages
- 7
- DOI
- https://doi.org/10.22323/1.364.0474
- Publication date
- 2019
- Austrian Fields of Science 2012
- 103034 Particle physics
- Keywords
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/flavourexotic-tetraquarks-in-largec-qcd-do-they-exist(23621fab-62c9-4ba4-bb40-6273fe105504).html