arXiv:hep-ph/9610520·v2·High Energy Physics — Phenomenology
Suppression of PiNN(1535) Coupling in the QCD Sum Rule
D. Jido🇯🇵 · M. Oka (Tokyo Inst. of Tech.)🇯🇵 · A. Hosaka (Numazu Coll. of Tech.)🇯🇵
Abstract
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.
Comments: 6 pp, LaTeX