The BGOOD experimental setup at ELSA

Abstract

The BGOOD experiment at the ELSA facility in Bonn has been commissioned within the framework of an international collaboration. The experiment pursues a systematic investigation of non-strange and strange meson photoproduction, in particular t-channel processes at low momentum transfer. The setup uniquely combines a central almost 4π acceptance BGO crystal calorimeter with a large

Light Baryon Spectroscopy

“…30) up to an incoming photon energy of 1.6 GeV [230]. Higher energies are covered by the CBELSA/TAPS [5], the BGOOD [137] and the CLAS [231,232,233] data. The LEPS experiment contributed to the database with precise data for the backward angles (1 < cos θ cms η < 0.6) for the photon energy range of 1.6 -2.4 GeV [234].…”

“…After the CB-TAPS experiment, see Sec. 4.3.2, moved to a different experimental area, a new experiment was built-up: the BGOOD experiment [137], see Fig. 17.…”

“…This is remarkable since different η decay modes were used to reconstruct the η meson. While the neutral decay modes η → γγ and η → π 0 π 0 π 0 were measured with the GRAAL [235], CBELSA/TAPS [5] and Crystal Ball/TAPS [4,230] experiments, the charged decay mode η → π + π − π 0 was measured by the CLAS [231,232,233] and BGOOD [137] experiments. The LEPS experiment detected protons that scattered at forward angle and reconstructed the η as a missing particle [234].…”

“…In addition, this data helps to constrain the t-channel K and K * exchange at forward angles and low momentum transfer. More data regarding strangeness photoproduction can be expected from the BGOOD facility in the future [137,328,329,330].…”

Coupled-channel analysis of pion- and eta-electroproduction with the Jülich-Bonn-Washington model

“…A viable alternative to this, specifically advantageous for detecting unstable intermediate states with small branching ratios to the πN channel, are photon-induced reactions [6]. Large data bases have been accumulated for these reactions as part of the extensive experimental programs at Jefferson Laboratory, MAMI, ELSA and other facilities [7][8][9][10][11][12][13][14][15][16][17][18].…”