Münster 2017 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 46: Hadron Structure and Spectroscopy VI
HK 46.7: Vortrag
Donnerstag, 30. März 2017, 18:45–19:00, F 5
Measuring the branching fraction of ω → η γ with the Crystal Ball Experiment at MAMI — •Oliver Steffen and Wolfgang Gradl for the A2 collaboration — Institut für Kernphysik, Johannes Gutenberg-Universität Mainz
The Crystal Ball Collaboration uses energy tagged bremstrahlung photons produced from the MAMI electron beam to study photo-induced reactions on nucleons and nuclei. The Crystal Ball/TAPS 4π calorimeter setup is optimized for the detection of neutral final states. Charged particles are identified and measured by the inner detector system.
A large data set of photoproduced η′ and ω mesons has been obtained during recent data taking periods with the End Point Tagger (Eγ= 1.4 to 1.6 GeV) and the liquid hydrogen target.
With this dataset we want to measure the branching fraction of the ω → η γ decay. This is useful for understanding the pseudo vector-gamma interaction within effective field theories. In this talk we will give an overview of the ongoing analysis.