Cluster Reducibility of Multiquark Operators and Tetraquark-Adequate QCD Sum Rules

Abstract

If connecting properties of a multiquark hadron with those exhibited by its constituents, QCD sum rules inferred along the routes of traditional wisdom necessarily involve contributions not related at all to and thus not presenting information about multiquarks. Realizing this deficiency, we propose to increase, for the example of tetraquarks, the predictive power of the QCD sum-rule formalism by disposal of all of the unwanted contributions from the very beginning; this move is easily accomplished by subjecting the contributions to our perspicuous selection criterion.

Comments: 5 pages, 5 figures, talk presented at the "Hadron 2021 - 19th International Conference on Hadron Spectroscopy and Structure" (26 - 31 July 2021, Mexico City, Mexico)