We review the description of the lowest-energy nucleon excitation—the Δ (1232)-resonance.
Much of the recent experimental effort has been focused on the precision measurements of …

Recent experimental and theoretical advances in investigating electromagnetic meson
production reactions in the nucleon resonance region are reviewed. We give a description of …

Elastic πN scattering and the world data of the family of reactions π− p→ ηn, K 0 Λ, K 0 Σ 0,
K+ Σ−, and π+ p→ K+ Σ+ are described simultaneously in an analytic, unitary, coupled …

An effective Hamiltonian consisting of bare Δ⇆ πN, γN vertex interactions and energy-
independent meson-exchange πN⇆ πN, γN transition operators is derived by applying a …

The small electric quadrupole E 2 amplitude of the predominantly magnetic dipole M 1 p→ Δ
(1232) transition has been measured using 270 to 420 MeV tagged linearly polarized …

The dynamical model developed by us [Phys. Rev. C 54, 2660 (1996)] has been applied to
investigate the pion electroproduction reactions on the nucleon. It is found that the model …

We show how the gauge-invariance formulation given by Haberzettl is implemented in
practice for photoproduction amplitudes at tree level with form factors describing composite …

Starting from a unitary effective Lagrangian model for the meson-nucleon scattering
developed in T. Feuster and U. Mosel, Phys. Rev. 58, 457 (1998), we come to a unified …

The analytic properties of scattering amplitudes provide important information. Besides the
cuts, the poles and zeros on the different Riemann sheets determine the global behavior of …

We present a nucleon resonance analysis by simultaneously considering all pion-and
photon-induced experimental data on the final states γ N, π N, 2 π N, η N, K Λ, K Σ, and ω N …