Vector-meson-baryon coupling constants in QCD sum rules

Journal Article · Sun Oct 15 04:00:00 EDT 2006 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.74.045201· OSTI ID:20863884

Erkol, G; Timmermans, R G. E.; Rijken, Th A ^[1]

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1. Theory Group, KVI, University of Groningen, Groningen (Netherlands)

The external-field quantum chromodynamics (QCD) sum rules method is used to evaluate the coupling constants of the vector mesons {rho} and {omega} to the nucleon and the {lambda},{sigma}, and {xi} baryons. It is shown that these coupling constants as calculated from QCD sum rules are consistent with SU(3)-flavor relations. By assuming ideal mixing, this leads to a determination of the F/(F+D) ratio of the vector-meson octet: we find {alpha}{sub v}=1 and {alpha}{sub m}=0.18 for the vector and the magnetic F/(F+D) ratios, respectively. The sensitivity of the results to the unknown vacuum susceptibility {zeta} is discussed. The coupling constants with SU(3)-breaking effects taken into account are also calculated.

• OSTI ID: 20863884
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 74; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COUPLING CONSTANTS
FLAVOR MODEL
LAMBDA BARYONS
MIXING
NUCLEONS
OMEGA-782 MESONS
QUANTUM CHROMODYNAMICS
RHO-770 MESONS
SIGMA BARYONS
SUM RULES
XI BARYONS