Kaon-baryon coupling constants from QCD sum rules analysis

We study the KNΣ and KNΛ coupling constants using QCD sum rules. We consider the correlators of two interpolating baryon fields taken with kaon in initial state. 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 rules yield stable results with values for the couplings of gKNΣ≃3.6±2 and gKNΛ≃10±6. The sources of uncertainty are discussed.