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.