Tetraquark Properties at Large <i>N</i>_c

Autor(en)

Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian

Abstrakt

Considering quantum chromodynamics in the consistent limit of simultaneous correlated increase of the number of colours, $N_{\rm c}$, 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-$N_{\rm c}$ 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(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

374

Anzahl der Seiten

5

DOI

https://doi.org/10.22323/1.374.0078

Publikationsdatum

2019

ÖFOS 2012

103034 Teilchenphysik

Schlagwörter

ASJC Scopus Sachgebiete

General

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/tetraquark-properties-at-large-nc(4d31d16e-1c42-4e52-893c-ea88c42d0704).html