Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HK: Fachverband Hadronen und Kerne
HK 51: Fundamental Symmetries
HK 51.7: Vortrag
Mittwoch, 18. März 2009, 15:45–16:00, H-ZO 70
Studies of the rare eta-meson decay η→π0+e++e− at WASA-at-COSY — •Alexander Winnemöller, Alfons Khoukaz, Florian Bergmann, Annika Passfeld, and Tobias Rausmann — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 9, D-48149 Münster, Germany
One main focus of the experimental program of the WASA-at-COSY facility is the investigation of symmetries and symmetry breakings to get a better understanding of the strong interaction physics. Since violations of conservation laws are directly connected to symmetry breaking effects, studies of rare meson decays are of high importance. In this connection the η-meson is of paticular interest. Precision measurements of rare η decays can be used to get new limits on the breaking of the fundamental C, P, and T symmetries, or combinations thereof.
In this contribution we will present and discuss studies of the C-violating η decay η→π0+e++e− using the WASA-at-COSY facility. The dominant C conserving contribution to the decay is via π0+γ*+γ* intermediate state with an expected branching ratio of approximately 10−8. An observation of a significantly higher branching ratio would, therefore, be an indication of a C violation. The status of the analysis will be presented and discussed.
Supported by FZ Jülich, BMBF, and Wallenberg Foundation.