Scalar-meson-baryon coupling constants in QCD sum rules

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

DOI:https://doi.org/10.1103/PhysRevC.73.044009· OSTI ID:20771426

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

---

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

The external-field QCD sum rules method is used to evaluate the coupling constants of the light isoscalar-scalar meson (''{sigma}'' or {epsilon}) to 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, which leads to a determination of the F/(F+D) ratio of the scalar octet assuming ideal mixing: we find {alpha}{sub s}{identical_to}F/(F+D)=0.55. The coupling constants with SU(3) breaking effects are also discussed.

• OSTI ID: 20771426
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 4 Vol. 73; 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
MESON OCTETS
QUANTUM CHROMODYNAMICS
SCALAR MESONS
SIGMA BARYONS
SU-3 GROUPS
SUM RULES
SYMMETRY BREAKING
XI BARYONS