Suppression of PiNN(1535) Coupling in the QCD Sum Rule
D. Jido, M. Oka, A. Hosaka
Abstract
The πNN* and ηNN* 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 πNN* couplings vanish, while ηNN* couplings remain finite. This result explains a relatively suppressed coupling of πNN(1535) as compared with others. We compare the present result with predictions of low energy effective models.
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