Volume 374 - Light Cone 2019 - QCD on the light cone: from hadrons to heavy ions (LC2019) - Contributed
Tetraquark properties at large $N_c$
W. Lucha, D. Melikhov, H. Sazdjian*
*corresponding author
Full text: pdf
Pre-published on: May 06, 2020
Published on: May 26, 2020
Abstract
Considering quantum chromodynamics in the consistent limit of simultaneous correlated increase of the number of colours, $N_c$, 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-$N_c$ 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.
DOI: https://doi.org/10.22323/1.374.0078
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