Frankfurt 2014 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Hadronenstruktur und -spektroskopie
HK 23.5: Vortrag
Dienstag, 18. März 2014, 18:00–18:15, HZ 1+2
Energy Calibration for the Forward Detector at WASA-at-COSY — •Kay Demmich, Florian Bergmann, Patrice Hüsemann, Nils Hüsken, Alexander Täschner, and Alfons Khoukaz for the WASA-at-COSY collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster
Studies on rare and forbidden decays of light mesons are one main aspect of the WASA-at-COSY physics program. In this context a large data set of η mesons has been produced in proton proton scattering in order to investigate the decay properties of this meson. This high statistic measurement allows, e.g., for the search for the C parity violating reaction η → π0 + e+ + e−, for which only an upper limit for the relative branching ratio of 4 × 10−5 is quoted by the particle data group. The analysis of this forbidden decay channel relies on an effective separation of the physical background which is mainly caused by the direct pion production. To handle this background a missing mass analysis and kinematic fitting will be applied. Since both methods rely on a high energy resolution of the forward detector this detector, which measures the proton energies, has to be calibrated very carefully. In this contribution, a new calibration software is presented which has been developed especially for proton-proton measurements, and which allows for a precise determination of the calibration parameters by the mean of a graphical user interface and a dedicated fitting algorithm. Moreover, with this tool a run-by-run calibration can be realised. First results of the improved calibration will be presented.
*Supported by COSY-FFE grants