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Bochum 2018 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 45: Hadron Structure and Spectroscopy VIII

HK 45.7: Vortrag

Donnerstag, 1. März 2018, 15:45–16:00, HZO 50

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, Germany

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.

Preliminary differential cross sections, and recoiling baryon asymmetries will be shown.

Supported by DFG (PN 50165297).

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