PIONIC CONTENT OF RHO-NN AND RHO-N-DELTA VERTEX FUNCTIONS

The dynamical content of rhoNN and rhoNDELTA vertex functions is studied with a mesonic model. A set of coupled integral equations satisfied by these vertex functions was solved self-consistently. These solutions indicate that the dominant mesonic content arises from di-pion dynamics. With the experimentally determined pion-baryon-baryon coupling constants and ranges as input, the model predicts a g(rhoNN) that agrees with the meson-exchange-potential results. On the other hand, it predicts a smaller f(rhoNDELTA) and much softer form factors. Implications of the findings on the use of phenomenological coupling constants in nuclear reaction studies are discussed.