Strong coupling constant of negative parity nucleon with $\pi$ meson in light cone QCD sum rules

Abstract

We estimate strong coupling constant between the negative parity nucleons with $\pi$ meson within the light cone QCD sum rules. A method for eliminating the unwanted contributions coming from the nucleon--nucleon and nucleon--negative parity nucleon transition is presented. It is observed that the value strong coupling constant of the negative parity nucleon $N^{\ast }{N}^{\ast }\pi$ transition is considerably different from the one predicted by the 3--point QCD sum rules, but is quite close to the coupling constant of the positive parity $NN\pi$ transition.

Comments: 14 pages, 4 figures, LaTeX formatted