Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 73: Hadronenstruktur und -spektroskopie

HK 73.4: Talk

Thursday, March 7, 2013, 17:45–18:00, HSZ-105

Discussion on a complete experiment for single pseudoscalar meson photoproduction — •Yannick Wunderlich — HISKP University of Bonn

Photoproduction of single pseudoscalar mesons poses a commonly used tool for the study of the nucleon excitation spectrum. In this reaction, the measurement of 16 different polarization observables is possible. The observables comprise a rich volume of accessible experimental information, usable for the disentanglement of the strongly overlapping resonances of the nucleon.
Since the beginning of the 1970s, the problem of the so called complete experiment started to emerge in the literature. It deals with the question which minimum subsets of all 16 polarization observables are sufficient in order to maximally constrain the underlying amplitudes. This optimization problem is important in the context of currently ongoing polarization measurements at facilities like MAMI, JLAB and ELSA. In the 1990s, it was shown that 8 carefully chosen observables suffice to yield a complete experiment. However, in the low energy region of certain photoproduction channels and in connection to a maximally model independent truncated partial wave analysis, there exists the realistic chance for achieving completeness with even less than 8 observables.
This talk will state and discuss the origin of the above mentioned results. Supported by the Deutsche Forschungsgemeinschaft (SFB/TR∼16).