Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 37: Hadronic Probes IV, Interaction of Pions

HK 37.4: Talk

Tuesday, March 17, 1998, 18:30–18:45, C

Model for Pionic Off-shell Vertices of the Nucleon and the Δ Isobar. — •S. Kondratyuk, O. Scholten, and G.H. Martinus — Kernfysisch Versneller Instituut, 9747 AA Groningen, the Netherlands

The structures of the Δ−N−π and N−N−π vertices are addressed, where the initial particles (the Δ or the nucleon) are off-shell. The dependence of these vertices on the invariant mass of the initial particle is described by half-off-shell form factors. A self-consistent microscopic model for the form factors is presented based on the use of sidewise dispersion relations. This guarantees that causality relations are satisfied. A similar formalism is also applied to photon-nucleon vertices.

Results for nucleonic and Δ-isobar form factors are presented.