Dresden 2013 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 42: Hadronenstruktur und -spektroskopie
HK 42.7: Talk
Tuesday, March 5, 2013, 18:30–18:45, HSZ-304
Energy Calibration for the Forward Detector at WASA-at-COSY* — •Kay Demmich, Florian Bergmann, Paul Goslawski, Nils Hüsken, Florian Schepers, Alexander Täschner, and Alfons Khoukaz — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster
One focus of the WASA-at-COSY physics program is the investigation of meson productions and rare meson decays. The experimental setup itself allows for meson production in scattering reactions with any combination of protons and deuterons. The forward scattered ejectiles can be detected in the forward detector and the four-momenta can be reconstructed e.g. for missing mass studies. Generally the energy calibration of the forward detector is performed by comparing measured with simulated or calculated energy loss distributions in different detector layers as function of the ejectile energy. For investigations on the η′ production in the p+d→ 3He+η′ reaction the accuracy of this calibration is crucial since the reaction cross section is very small compared to background reactions. A new powerful tool to calibrate the forward detector is presented. It enables the variation of the calibration parameters within a graphical user interface and a following optimization by an adjusted method based on least square fitting. Although primarily developed for the η′ production, this program has been applied successfully to an η production data set, as well, and can be adapted for 3He and 4He production reactions. In this talk the calibration method and first results of the implementation will be presented.
*Supported by COSY-FFE grants