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 …

We discuss the nucleon to higher-spin N-and Δ-resonance transitions by pions and photons.
The higher-spin baryons are described by Rarita-Schwinger fields and, as we argue, this …

The Rarita–Schwinger theory of free massive spin-3/2 field obeys the physical degrees of
freedom counting, and one can distinguish “consistent” couplings which maintain this …

We develop an extension of chiral perturbation theory to the Δ (1232)-resonance energy
region and apply it to investigate the pion electroproduction off the nucleon (eN→ eN π). We …

Abstract η meson production in both proton-proton and proton-neutron collisions is
investigated within a relativistic meson exchange model of hadronic interactions. It is found …

We investigate photoproduction of η mesons off protons and neutrons within a coupled-
channels effective-Lagrangian method that is based on the K-matrix approach. The two …

A coupled-channels analysis, based on the K-matrix approach, is presented for photo-
induced kaon production. It is shown that channel coupling effects are large and should not …

A microscopic calculation of Compton scattering on the nucleon is presented which
encompasses the lowest energies—yielding nucleon polarizabilities—and extends to …

A bstract Using an effective field theory approach for higher-spin fields, we derive the
interactions of colour singlet and electrically neutral particles with a spin higher than unity …

The observation of an anomalous J/ψ suppression in Pb–Pb collisions by the NA50
Collaboration can be considered as the most striking indication for the deconfinement of …