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-N-c 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/N-c(2)), so they are parametrically narrower compared to the ordinary (q) over barq mesons, which have a width of order O(1/N-c). Moreover, for flavor-exotic states, the consistency of the large-N-c 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), Lomonosov Moscow State University (MSU), 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