Suppression of PiNN(1535) Coupling in the QCD Sum Rule
A. Hosaka, D. Jido, M. Oka
Abstract
The πNN* and ηNN* coupling constants are studied in the QCD sum rule ($N* N(1535)). We investigate the two point functions between the vacuum and a one meson state in the soft meson limit. The operator product expansion is explicitly performed up to terms of dimension eight. We find that vanishes to this order, while has a finite contribution. The vanishing of is a rigorous consequence in the chiral limit. The results of the QCD sum rule are compared with those of low energy effective models.
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