Exotic Tetraquark Mesons in Large-$N_c$ Limit: an Unexpected Great Surprise

TL;DR

This paper explores the implications of large-$N_c$ QCD on exotic tetraquark mesons, revealing constraints on their spectrum through consistency criteria derived from meson scattering analysis.

Contribution

It introduces a novel approach to understanding the spectrum of exotic tetraquark states using large-$N_c$ QCD and meson scattering consistency conditions.

Findings

Constraints on exotic tetraquark spectrum at leading order in $N_c$

Identification of consistency criteria for tetraquark contributions

Implications for the nature of exotic meson states

Abstract

Two-ordinary-meson scattering in large-$N_c$ QCD implies consistency criteria for intermediate-tetraquark contributions. Their fulfilment at $N_c$-leading order constrains the nature of the spectrum of genuinely exotic tetraquark states.