Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 11: Hadron Structure and Spectroscopy II
HK 11.3: Vortrag
Dienstag, 28. März 2017, 11:30–11:45, F 5
K+Λ and K+Σ0 photoproduction at extremely forward angles with the BGO-OD experiment — •Thomas Jude for the BGO-OD collaboration — Physikalisches Institut, Universität 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.
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 a dominant role. As part of an extensive strangeness photoproduction experimental programme, the differential cross section measurements for K+Λ and K+Σ0 photoproduction at centre of mass polar angles between 4∘ to 25∘ will be presented.
These first data at extremely forward angles are important for partial wave analyses, and models where accurate knowledge of t-channel mechanisms are required. The data also constrain models for hypernuclei electroproduction, where at very low Q2, the K+Λ cross section is comparable to photoproduction.
Forward K+ identification, fitting techniques to separate signal from background, and preliminary results will be shown.