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 this 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.

Keywords

• cryptoexotic hadron
• tetraquark adequacy
• large-<i>N</i>_c limit
• 1/<i>N</i>_c expansion
• QCD sum rule