Flavour-Exotic Tetraquarks in Large-Ν_c QCD: Do They Exist?

Autor(en)

Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian

Abstrakt

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(en)

Teilchenphysik

Externe Organisation(en)

Österreichische Akademie der Wissenschaften (ÖAW), Lomonosov Moscow State University (MSU), Universität Wien, Institut de Physique Nucléaire, CNRS-IN2P3

Journal

Proceedings of Science (PoS)

Band

364

Anzahl der Seiten

7

DOI

https://doi.org/10.22323/1.364.0474

Publikationsdatum

2019

ÖFOS 2012

103034 Teilchenphysik

Schlagwörter

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/flavourexotic-tetraquarks-in-largec-qcd-do-they-exist(23621fab-62c9-4ba4-bb40-6273fe105504).html