Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Hadron Structure and Spectroscopy 11

HK 56.2: Talk

Thursday, March 26, 2015, 15:00–15:15, T/SR25

Complete Experiments for pseudoscalar meson photoproduction — •Yannick Wunderlich for the CBELSA/TAPS collaboration — Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn

The investigation of the nucleon excitation spectrum has been an important experimental and theoretical task in the recent years. Once this highly complicated bound system of strongly interacting particles is understood, it will yield valuable insights into the workings of QCD. One of the most interesting reactions is the production of mesons by impinging photons off a nucleon target. When only one pseudoscalar meson ϕ is produced in the reaction γ N→ ϕ N, 16 polarization observables (not completely independent) can be accessed via the spin degrees of freedom of the incident and final states.
A so called ’Complete Experiment’ allows the unambiguous extraction of the underlying amplitudes. It has been shown that at least 8 carefully selected observables have to be measured for this purpose. For a truncated partial wave expansion, considering only the partial waves that contribute significantly in the energy range of interest, fewer observables can be already sufficient. This presentation will discuss such truncated analyses with special focus on the influence of measurement uncertainties. Supported by the Deutsche Forschungsgemeinschaft (SFB/TR16).