1. Zooming in on Multiquark Hadrons within QCD Sum-Rule Approaches.
- Author
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Lucha, Wolfgang, Melikhov, Dmitri, and Sazdjian, Hagop
- Subjects
- *
SELF-consistent field theory , *QCD sum rules (Nuclear physics) , *FLAVOR in particle physics , *HADRONS , *QUARKS - Abstract
Aiming at self-consistent descriptions of multiquark hadrons (such as tetraquarks, pentaquarks, hexaquarks) by means of QCD sum rules, we note that the totality of contributions to two-point or three-point correlation functions that involve, respectively, either two or just a single operator capable of interpolating the particular multiquark under study can be straightforwardly disentangled into two disjoint classes defined by unambiguously identifiable members. The first is formed by so-called multiquark-phile contributions which indeed might support multiquarks. In the case of flavour-exotic tetraquarks, by definition composed of four (anti–) quarks of mutually different flavours, a tetraquark-phile contribution has to exhibit two or more gluon exchanges of appropriate topology. The second consists of contributions evidently not bearing any relation to multiquarks; these must be discarded when studying multiquarks by QCD sum rules. The first class only should enter the "multiquark-adequate" QCD sum rules for exotic hadrons. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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