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Narrow exotic tetraquark mesons in large-$N_c$ QCD
- Source :
- Phys. Rev. D 96, 014022 (2017)
- Publication Year :
- 2017
-
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 $\bar qq$ 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.<br />Comment: 5 pages, version to appear in PRD, minor text modifications, conclusions remain unchanged
- Subjects :
- High Energy Physics - Phenomenology
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. D 96, 014022 (2017)
- Publication Type :
- Report
- Accession number :
- edsarx.1706.06003
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevD.96.014022