Tetraquark-adequate QCD sum rules for quark-exchange processes
- Autor(en)
- Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian
- Abstrakt
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 non-overlapping 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 $O(\alpha_s^2)$.
- Organisation(en)
- Teilchenphysik
- Externe Organisation(en)
- Österreichische Akademie der Wissenschaften (ÖAW), Lomonosov Moscow State University (MSU), Universität Wien, Université Paris-Saclay
- Journal
- Physical Review D
- Band
- 100
- Anzahl der Seiten
- 8
- ISSN
- 2470-0010
- DOI
- https://doi.org/10.1103/PhysRevD.100.074029
- Publikationsdatum
- 10-2019
- Peer-reviewed
- Ja
- ÖFOS 2012
- 103012 Hochenergiephysik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Physics and Astronomy (miscellaneous)
- Link zum Portal
- https://ucris.univie.ac.at/portal/de/publications/tetraquarkadequate-qcd-sum-rules-for-quarkexchange-processes(a94b16f3-5696-43d9-9f79-f0168c3f4469).html