Narrow exotic tetraquark mesons in large-N-c QCD

Autor(en)

Wolfgang Lucha, Dmitri Melikhov, Hagop Sazdjian

Abstrakt

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(en)

Teilchenphysik

Externe Organisation(en)

Österreichische Akademie der Wissenschaften (ÖAW), Lomonosov Moscow State University (MSU), Technische Universität Wien, Université Paris XI - Paris-Sud

Journal

Physical Review D

Band

96

Anzahl der Seiten

4

ISSN

2470-0010

DOI

https://doi.org/10.1103/PhysRevD.96.014022

Publikationsdatum

07-2017

Peer-reviewed

Ja

ÖFOS 2012

103034 Teilchenphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/2c5f8437-696b-47e5-8323-8f735224e9a3