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Münster 2017 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 46: Hadron Structure and Spectroscopy VI

HK 46.6: Talk

Thursday, March 30, 2017, 18:30–18:45, F 5

Upper limit of the η-decay η→π0 + e+ + e with WASA-at-COSY* — •Florian Bergmann, Kay Demmich, Nils Hüsken, and Alfons Khoukaz for the WASA-at-COSY collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Germany

Investigations on symmetries and symmetry breaking allow for a better understanding of the physics within the standard model. The study of rare meson decays is an elegant way to search for violation of conservation laws, and hence symmetry breaking effects. An extensive physics program on η-meson decays has been performed as part of the WASA-at-COSY experiment. Due to the high statistics of the measurements new limits on e.g., the C, P and T symmetry breaking or combinations thereof can be determined.
This contribution will present recent results of the analysis of the C-violating η-decay η→π0 + e+ + e using the high statistics p+d3He+η data obtained with WASA-at-COSY. In a further contribution by the WASA-at-COSY collaboration insights on the analysis based on the p+pp+p+η data, also obtained with WASA-at-COSY, will be given. 1em *Supported by FFE program of the Forschungszentrum Jülich.

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