Scalar-Meson - Baryon Coupling Constants in QCD Sum Rules

Abstract

The external-field QCD Sum Rules method is used to evaluate the coupling constants of the light-isoscalar scalar meson (``σ'' or ε) to the Λ, Σ, and Ξbaryons. 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 α_s \equiv F/(F+D)=0.55. The coupling constants with SU(3) breaking effects are also discussed.

15 pages, 8 figures, to be published in Phys. Rev. C

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• QCD Sum Rules study of meson-baryon sigma terms
• $\pi B_8{B}_8$ and $\sigma B_8{B}_8$ couplings from a chiral quark potential model
• A new combined analysis of elastic and charge exchange $KN(\bar{K}N)$ scatterings in the Regge realm