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Suppression of PiNN(1535) Coupling in the QCD Sum Rule

D. Jido·M. Oka·A. Hosaka
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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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D. Jido, M. Oka, A. Hosaka. 1997-02-17. Suppression of PiNN(1535) Coupling in the QCD Sum Rule. https://arxiv.org/abs/hep-ph/9610520

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