a(1)-meson-baryon coupling constants in the framework of soft-wall and hard-wall AdS/QCD models

摘要

We calculate the a(1)-meson-nucleon (Delta-baryon) coupling constant in the framework of soft-wall and hard-wall AdS/QCD models. Interaction Lagrangian in the bulk of AdS space was written for a minimal gauge coupling, a magnetic type coupling and a triple coupling of bulk fields. Applying AdS/CFT correspondence from the bulk interaction Lagrangian, we obtain holographic expressions for the a(1)-axial-vector meson-nucleon (Delta-baryon) coupling constant in the boundary QCD theory. Numerical results for the g(a1NN) coupling constant in the framework of both models are close to the known phenomenological estimates. The g(a1)Delta Delta-axial-vector meson-Delta-baryon coupling constant was considered in the framework of hard-wall model.