Meson-baryon coupling constants from QCD sum rules

The QCD Sum Rules method which links the hadronic degrees of freedom with the underlying QCD parameters, serves as a very useful tool to extract qualitative and quantitative information about hadron properties. The QCD sum rules method has been extensively used to investigate the meson-baryon couplings, especially the pseudoscalar meson-nucleon case where the calculations of the pion-nucleon coupling constant reproduce the empirical value fairly well. In this work, the meson baryon coupling constants are analyzed using QCD sum rules method, with an emphasis on the scalar meson-nucleon interactions which play an important role in one boson exchange (OBE) models of nucleon-nucleon (NN) and hyperon-nucleon (YN) interactions. The coupling constants obtained are compared with the results of Nijmegen NN potential model