Münster 2011 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 43: Hadronenstruktur und -spektroskopie VIII
HK 43.6: Vortrag
Mittwoch, 23. März 2011, 17:45–18:00, HS3
Determination of the upper limit of the forbidden η decay η→π0+e++e− with WASA-at-COSY — •Florian Bergmann, Alexander Winnemöller, Kay Demmich, Paul Goslawski, Christina Husmann, Alfons Khoukaz, Annika Passfeld, Tobias Rausmann, and Alexander Täschner for the WASA-at-COSY collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster
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 fundamental 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 a 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 physics beyond the standard model. The status of the analysis will be presented and discussed.
Supported by COSY-FFE