Suppression of PiNN(1535) Coupling in the QCD Sum Rule
  The \pi NN^* and \eta NN^* coupling constants are studied based on the two point functions between the vacuum and a one meson state in the soft meson limit. In terms of a suitably constructed interpolating field for the nucleon and resonances, we have found that the \pi NN^* couplings vanish, while \eta NN^* couplings remain finite. This result explains a relatively suppressed coupling of \pi NN(1535) as compared with others. We compare the present result with predictions of low energy effective models. 
D. Jido, M. Oka (Tokyo Inst. of Tech.) and A. Hosaka (Numazu Coll. of   Tech.)