Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Hadron Structure and Spectroscopy VIII

HK 47.3: Vortrag

Donnerstag, 17. März 2016, 14:45–15:00, S1/01 A5

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 (E_γ= 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. This work is supported by DFG under contract SFB1044.