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πρ scattering and the π NN form factor

1993; American Physical Society; Volume: 71; Issue: 13 Linguagem: Inglês

10.1103/physrevlett.71.1978

1092-0145

Gerhard Janssen, J.W. Durso, K. Holinde, B. C. Pearce, J. Speth,

Physics of Superconductivity and Magnetism

We investigate \ensuremath{\pi}\ensuremath{\rho} scattering in the pseudoscalar (\ensuremath{\pi}) and axial-vector (${\mathit{A}}_{1}$) channel. Our model based on s- as well as t-channel meson exchange can resolve apparent discrepancies occurring in the analysis of the axial-vector ${\mathit{A}}_{1}$ meson. Furthermore, it leads to an appreciable softening of the \ensuremath{\pi}NN form factor in agreement with information from other sources. This strong contribution in the pionic channel substantiates earlier claims that inclusion of correlated \ensuremath{\pi}\ensuremath{\rho} exchange might allow the use of a soft \ensuremath{\pi}NN form factor in NN potential models and thus could resolve a long-standing puzzle.