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Tetraquark-adequate QCD sum rules for quark-exchange processes.
- Source :
-
Physical Review D: Particles, Fields, Gravitation & Cosmology . 10/15/2019, Vol. 100 Issue 8, p1-1. 1p. - Publication Year :
- 2019
-
Abstract
- We consider quark-hadron duality relations and QCD sum rules for correlators involving exotic tetraquark currents, here specializing to the case of quark-exchange processes. We point out the differences they exhibit with respect to the cases involving ordinary bilinear quark currents. Based on the observation that only diagrams possessing at least four-quark singularities can contribute to the formation of tetraquark states, we show that the quark-hadron duality relations and the corresponding sum rules split into two nonoverlapping relations. The ultimate tetraquark-adequate QCD sum rule is concerned only with one of these relations, in which the operator product expansion starts with diagrams of order O(αs²). [ABSTRACT FROM AUTHOR]
- Subjects :
- *OPERATOR product expansions
Subjects
Details
- Language :
- English
- ISSN :
- 24700010
- Volume :
- 100
- Issue :
- 8
- Database :
- Academic Search Index
- Journal :
- Physical Review D: Particles, Fields, Gravitation & Cosmology
- Publication Type :
- Periodical
- Accession number :
- 139594807
- Full Text :
- https://doi.org/10.1103/PhysRevD.100.074029