Baryon Spectroscopy - Recent results from the Crystal Barrel Experiment at ELSA -

C. Schmidt

doi:10.1051/epjconf/20100303002

EPJ

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Proceedings

Open Access

EPJ Web of Conferences 3, 03002 (2010)
https://doi.org/10.1051/epjconf/20100303002

Baryon Spectroscopy - Recent results from the Crystal Barrel Experiment at ELSA -^*

C. Schmidt^a for the CBELSA/TAPS collaboration

Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, 53115 Bonn, Germany

^a e-mail: schmidt@hiskp.uni-bonn.de

Abstract

To understand the spectrum and the properties of baryon resonances, the CBELSA/TAPS experiment investigates the photoproduction oﬀ the nucleon using linearly, circularly polarized or unpolarized photons impinging on a polarized or unpolarized target. Preliminary results on ﬁrst double polarization observables have been obtained for the reactions $vec{\gamma}{p}$ → pπ⁰ and $vec{\gamma}{p}$ → pη using both circular and linear polarized photons on a longitudinally polarized target. This data will ﬁnally provide important information for the partial wave analyzes used to extract the resonances from the data.