About 120 baryons and baryon resonances are known, from the abundant nucleon with u
and d light-quark constituents up to the Ξ b−=(bsd), which contains one quark of each …

The composite nature of baryons manifests itself in the existence of a rich spectrum of
excited states, in particular in the important mass region 1–2 GeV for the light-flavoured …

This review treats the advances in Light Baryon Spectroscopy of the last two decades, which
were mainly obtained by measuring meson-production reactions at photon facilities all over …

The photoproduction of 2 π 0 mesons off protons was studied with the Crystal Barrel/TAPS
experiment at the electron accelerator ELSA in Bonn. The energy of photons produced in a …

We review the last two decades of using photon beams to measure the production of
mesons, and in particular the information that can be obtained on the spectrum of light, non …

With an effective Lagrangian approach, we analyze several NN→ NN π π channels by
including various resonances with mass up to 1. 72 GeV. For the channels with the pion pair …

The production of η and η′ mesons in photon-and hadron-induced reactions on free and
quasi-free nucleons and on nuclei is reviewed. The extensive database on γ N→ η N, for …

Results are presented for the first measurement of the double-polarization helicity
asymmetry E for the η photoproduction reaction γ p→ η p. Data were obtained using the …

Recent results for the photoproduction of mesons off nuclei are reviewed. These
experiments have been performed for two major lines of research related to the properties of …

Masses, widths and photocouplings of baryon resonances are determined in a coupled-
channel partial-wave analysis of a large variety of data. The Bonn-Gatchina partial-wave …