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HK: Fachverband Physik der Hadronen und Kerne
HK 19: Hadron Structure and Spectroscopy 4
HK 19.2: Gruppenbericht
Montag, 23. März 2015, 17:30–18:00, T/SR25
Strangeness photoproduction at the BGO-OD experiment — •Thomas Jude for the BGO-OD collaboration — Physikalisches Institut, Universität Bonn, Nussallee 12, Bonn
The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremstrahlung photon beam to investigate the internal 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.
The BGO-OD is ideal for investigating the photoproduction of hadrons of non-zero strangeness. The high momentum resolution at forward angles covers a kinematic region where t-channel exchange mechanisms play a dominant role. This is complemented by the neutral and charged particle identification in the BGO calorimeter for the identification of hyperon decays.
The first part of an extensive physics programme includes measurements of the differential cross section at forward angles for γ p → K+ Λ and, using linearly polarised photons, the beam asymmetry, Σ, for γ p → K0 Σ+. This latter measurement is focussed on the K* threshold region where a cusp-like structure was recently observed in the total cross section.
Analysis of these reaction channels for both real and simulated data is presented.
Supported by DFG (SFB/TR-16).