Mission Target: Tetraquark Mesons of Flavour-Cryptoexotic Type

Abstract

Currently, flavour-cryptoexotic tetraquarks form the most common sort of all experimentally established exotic multiquark hadrons. This note points out a few promising concepts that should help improve theoretical (but, for several reasons, not quite straightforward) analyses of such kind of states: among others, their scope of application encompasses the strong interactions in the limit of (arbitrarily) large numbers of colours, and equally analytical and nonperturbative approaches to multiquark states.

arXiv comment12 pages, 2 figures

References in corpus (20)

• The $XYZ$ states: experimental and theoretical status and perspectives
• Tetraquark Mesons in Large $N$ Quantum Chromodynamics
• Possible interpretations of the $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$
• Narrow Tetraquarks at Large N
• Two-Hadron-Irreducible QCD Sum Rule for Pentaquark Baryon
• Hidden charm pentaquarks with color-octet substructure in QCD Sum Rules
• Narrow exotic tetraquark mesons in large-$N_c$ QCD
• Tetraquarks in large-$N_c$ QCD
• Tetraquark-adequate formulation of QCD sum rules
• Tetraquarks in the 1/N expansion and meson-meson resonances
• Tetraquark and two-meson states at large $N_{\mathrm{c}}$
• Quantum-Number Exotic Tetraquarks at Large $N_c$ in QCD(AS)
• Tetraquark-adequate QCD sum rules for quark-exchange processes
• Are there narrow flavor-exotic tetraquarks in large-$N_c$ QCD?
• Mass of $1^{-+}$ four-quark--hybrid mixed states
• Do near-threshold molecular states mix with neighbouring $\bar{Q}Q$ states?
• Exotic Tetraquark Mesons in Large-$N_c$ Limit: an Unexpected Great Surprise
• Axial-vector and pseudoscalar tetraquarks $[ud][\bar{c}\bar{s}]$
• Mission Target: Exotic Multiquark Hadrons -- Sharpened Blades
• Narrow-width tetraquarks in large-$N_{\mathrm{c}}^{}$ QCD