PI-RHO SCATTERING AND THE PI-NN FORM-FACTOR

We investigate pirho scattering in the pseudoscalar (pi) and axial-vec tor (A1) channel. Our model based on s- as well as t-channel meson exc hange can resolve apparent discrepancies occurring in the analysis of the axial-vector A1 meson. Furthermore, it leads to an appreciable sof tening of the piNN form factor in agreement with information from othe r sources. This strong contribution in the pionic channel substantiate s earlier claims that inclusion of correlated pirho exchange might all ow the use of a soft piNN form factor in NN potential models and thus could resolve a long-standing puzzle.