Kaon-baryon coupling constants in the QCD sum rule approach

Abstract

We improve our previous QCD sum rule calculation on g KN Λ and g KN Σ coupling constants by including the contributions from higher dimensional condensates,< q g s σ⋅ Gq> and< q q><(α s/π) G 2>, in the OPE. It is found that the contribution of these condensates is non-negligible compared to that of the quark condensates. Using a best-fit analysis we find| g KN Λ|= 2.49±1.25 and| g KN Σ|= 0.395±0.377.