Narrow exotic tetraquark mesons in large-N-c QCD
- Author(s)
- Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian
- Abstract
Discussing four-point Green functions of bilinear quark currents in large-Nc QCD, we formulate rigorous criteria for selecting diagrams appropriate for the analysis of potential tetraquark poles. We find that both flavor-exotic and cryptoexotic (i.e., flavor-nonexotic) tetraquarks, if such poles exist, have a width of order O(1/Nc2), so they are parametrically narrower compared to the ordinary q-q mesons, which have a width of order O(1/Nc). Moreover, for flavor-exotic states, the consistency of the large-Nc behavior of "direct" and "recombination" Green functions requires two narrow flavor-exotic states, each coupling dominantly to one specific meson-meson channel.
- Organisation(s)
- Particle Physics
- External organisation(s)
- Österreichische Akademie der Wissenschaften (ÖAW), Anuchin Research Institute and Museum of Anthropology, Technische Universität Wien, Université Paris XI - Paris-Sud
- Journal
- Physical Review D
- Volume
- 96
- No. of pages
- 4
- ISSN
- 2470-0010
- DOI
- https://doi.org/10.1103/PhysRevD.96.014022
- Publication date
- 07-2017
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103034 Particle physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/narrow-exotic-tetraquark-mesons-in-largenc-qcd(2c5f8437-696b-47e5-8323-8f735224e9a3).html