Münster 2017 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 27: Poster

HK 27.5: Poster

Dienstag, 28. März 2017, 16:45–18:45, F Foyer

Development of a correction function for invariant masses of neutral mesons at the CBELSA/TAPS-experiment. — •Nils Stausberg for the CBELSA/TAPS collaboration — Helmholtz- Institut für Strahlen- und Kernphysik, Nussallee 14-16, 53115 Bonn

A good understanding of the baryon spectrum needs a precise examinatio of excited states and their decays. In order to extract contributing resonances from the data, cross sections and polarization observables are determined and further investigated by partial wave analysis.

The Crystal Barrel/TAPS experiment is ideally suited to measure the photoproduction of neutral mesons decaying into photons due to its good energy resolution, high detection efficiency for photons, and the nearly complete solid angle coverage.

A good reconstruction of the invariant mass of neutral mesons is of course essential for data analysis. Therefore, not only a precise measurement, but also sophisticated reconstruction techniques are needed. Dead material inside the detector system leads to energy losses in the calorimeter. Those do not only lead to too low photon energies, but also to asymmetric photon energy distributions and finally to angle and energy dependent deviations in the meson masses.

Here, a correction method is discussed using π⁰ → γγ and η → γγ as example.

Supported by the DFG (SFB/TR16).