Scalar-meson–baryon coupling constants in QCD sum rules

Scalar-meson–baryon coupling constants in QCD sum rules

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 w...

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Veröffentlicht in:Physical review. C, Nuclear physics Nuclear physics, 2006-04, Vol.73 (4), Article 044009
Hauptverfasser: Erkol, G., Timmermans, R. G. E., Oka, M., Rijken, Th. A.
Format: Artikel
Sprache:eng
Schlagworte:
COUPLING CONSTANTS
FLAVOR MODEL
LAMBDA BARYONS
MESON OCTETS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QUANTUM CHROMODYNAMICS
SCALAR MESONS
SIGMA BARYONS
SU-3 GROUPS
SUM RULES
SYMMETRY BREAKING
XI BARYONS
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Zusammenfassung: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.
ISSN:0556-2813
1089-490X
DOI:10.1103/PhysRevC.73.044009