Multiquark-Adequate QCD Sum Rules: the Case of Flavour-Exotic Tetraquarks

TL;DR

This paper refines QCD sum rules to specifically study flavor-exotic tetraquarks, eliminating contamination from conventional hadrons to better understand multiquark states.

Contribution

It introduces a method to isolate multiquark contributions in QCD sum rules, reducing interference from ordinary hadrons.

Findings

Effective removal of conventional hadron contributions from sum rules

Enhanced focus on multiquark state properties

Potential for more accurate predictions of exotic hadron characteristics

Abstract

Frequently, theoretical discussions of multiquark hadron states prove to be contaminated or even dominated by contributions of conventional hadrons. For the approach to QCD bound states in terms of QCD sum rules, we show how to get rid of all unwanted ordinary-hadron ballast by boiling down the traditional QCD sum-rule formalism to the nonconventional aspects in the focus of interest.