g_{D^{\ast }_{s}D K^{\ast }(892)} and g_{B^{\ast }_{s}B K^{\ast }(892)} 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 (“σ” or ǫ) to the Λ, Σ, and Ξ 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 αs ≡ F/(F + D) ...

Pion–baryon coupling constants in light cone QCD sum rules

We calculate the πΣΛ and πΣΣ coupling constants in light cone QCD sum rules for the structure σαβγ5p α q β. A comparison of our results on these coupling constants with prediction of the SU(3) symmetry is presented. e-mail: [email protected] e-mail: [email protected]

Vector-meson-baryon coupling constants in QCD sum rules

Determination of pion-baryon coupling constants from QCD sum rules.

We evaluate the πNN , πΣΣ and πΣΛ coupling constants using QCD sum rules based on pion-to-vacuum matrix elements of correlators of two interpolating baryon fields. The parts of the correlators with Dirac structure k/γ5 are used, keeping all terms up to dimension 5 in the OPE and including continuum contributions on the phenomenological side. The ratios of these sum rules to baryon mass sum rule...

New QCD Sum Rules for Nucleon Axial Vector Coupling Constants

Two new sets of QCD sum rules for the nucleon axial coupling constants are derived using the external-field technique and generalized interpolating fields. An in-depth study of the predicative ability of these sum rules is carried out using a Monte-Carlo based uncertainty analysis. The results show that the standard implementation of the QCD sum rule method has only marginal predicative power f...