Nature of Light Scalar Mesons from their Large-NcBehavior

2003/09/30 by J. R. Peláez, J. R. Pelaez · 12 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph #nucl-th

paper · pdf · doi:10.1103/physrevlett.92.102001

published as Phys.Rev.Lett.92:102001,2004 · 4 pages. Slightly shortened version to appear in Phys. Rev. Lett. Two typos corrected

arxiv created 2004/03/04 · openalex publication_date 2004/03/09 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01

Abstract

We show how to obtain information about the states of an effective field theory in terms of the underlying fundamental theory. In particular, we analyze the spectroscopic nature of meson resonances from the meson-meson scattering amplitudes of the QCD low energy effective theory, combined with the expansion in the large number of colors. The vectors follow a qq behavior, whereas the sigma, kappa, and f0(980) scalars disappear for large Nc, in support of a q q qq-like nature. The a0 shows a similar pattern, but the uncertainties are large enough to accommodate both interpretations.

Citations

• Chiral symmetry amplitudes in the S-wave isoscalar and isovector channels and the σ, f0(980), a0(980) scalar mesons
• N/Ddescription of two meson amplitudes and chiral symmetry
• A planar diagram theory for strong interactions
• Analysis of a K -Scattering Phase Shift and Evidence for the (900) Meson

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• Study of a possible S = + 1 dynamically generated baryonic resonance
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• On the nature of the and from their behavior in chiral dynamics
• Investigation ofa0–f0mixing
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