Strangeness Photoproduction at the BGO-OD experiment
1 Rheinische Friedrich-Willhelms-Universität Bonn, Physikalisches Institut, Nussallee 1-16, 53115 Bonn Germany
2 Helmholtz-Institut fuer Strahlen- und Kernphysik, Universitaet Bonn, Nussallee 1-16 D-53115 Bonn Germany
3 Lamar University, Department of Physics, Beaumont, Texas 77710 USA
4 INFN Roma “Tor Vergata", Rome, Italy
5 Università di Roma “Tor Vergata", Via della Ricerca Scientifica 1, 00133 Rome Italy
6 INFN sezione di Roma La Sapienza, P.le Aldo Moro 2, 00185 Rome Italy
7 Istituto Superiore di Sanita, Viale Regina Elena 299, 00161 Rome Italy
8 Petersburg Nuclear Physics Institute, Gatchina, Leningrad District, 188300, Russia
9 Russian Academy of Sciences Institute for Nuclear Research, prospekt 60-letiya Oktyabrya 7a,, Moscow 117312 Russia
10 INFN - Laboratori Nazionali di Frascati, Via E. Fermi 40, 00044 Frascati Italy
11 INFN sezione Catania, 95129, Catania Italy
12 Universita degli Studi di Messina, Via Consolato del Mare 41, 98121 Messina Italy
13 INFN sezione di Pavia, Via Agostino Bassi, 6 - 27100 Pavia, Italy
* Corresponding author: firstname.lastname@example.org
Published online: 22 September 2020
The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon. The setup consists of a highly segmented BGO calorimeter surrounding the target, with a particle tracking magnetic spectrometer at forward angles.
BGO-OD is ideal for investigating low momentum transfer processes due to the acceptance and high momentum resolution at forward angles. In particular, this enables the investigation of strangeness photoproduction where t-channel exchange mechanisms play an important role. This also allows access to low momentum exchange kinematics where extended, molecular structure may manifest in reaction mechanisms.
First key results at low t indicate a cusp-like structure in K+Σ0 photoproduction at W = 1900 MeV, line shapes and differential cross sections for K+Λ(1405)→ K+Σ0π0, and a peak structure in K0SΣ0 photoproduction. The peak in the K0SΣ0 channel appears consistent with meson-baryon generated states, where equivalent models have been used to describe the PC pentaquark candidates in the heavy charmed quark sector.
© The Authors, published by EDP Sciences, 2020
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