Tetraquark Properties at Large <i>N</i><sub>c</sub>

Author(s)
Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian
Abstract

Considering quantum chromodynamics in the consistent limit of simultaneous correlated increase of the number of colours, Nc, beyond bounds and decrease of the strong coupling to zero allows for solid statements about qualitative features of the class of "truly exotic" tetraquark mesons carrying four mutually distinct quark flavours. Consistency criteria extracted from correlation functions for two-ordinary-meson scattering suggest the existence of more than one such tetraquarks, at least, of two tetraquarks of identical quark-flavour content and large-Nc behaviour of the total decay widths but differing in, and hence discriminable by, their predominant decay modes into two conventional mesons. This pairwise appearance is in conflict with the unique variant of such a four-quark bound state arising from the binding of diquark and antidiquark to a tetraquark by the strong interactions.

Organisation(s)
Particle Physics
External organisation(s)
Österreichische Akademie der Wissenschaften (ÖAW), Lomonosov Moscow State University (MSU), Universität Wien, Institut de Physique Nucléaire, CNRS-IN2P3
Journal
Proceedings of Science (PoS)
Volume
374
No. of pages
5
DOI
https://doi.org/10.22323/1.374.0078
Publication date
2019
Austrian Fields of Science 2012
103034 Particle physics
Keywords
Portal url
https://ucris.univie.ac.at/portal/en/publications/tetraquark-properties-at-large-nc(4d31d16e-1c42-4e52-893c-ea88c42d0704).html