Darmstadt 2016 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 45: Postersession
HK 45.62: Poster
Mittwoch, 16. März 2016, 18:30–20:30, S1/05 22-24
η → π0 e+ e− with WASA-at-COSY: C-violation in electromagnetic meson decays* — •Kay Demmich, Florian Bergmann, Nils Hüsken, Karsten Sitterberg, and Alfons Khoukaz — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster
The C-symmetry and the invariance of the electromagnetic and the strong interaction under a charge conjugation transformation are basic concepts of the standard model. The electromagnetic decay η → π0 e+ e− via a virtual photon violates the C-parity and alternative C-conserving processes are strongly suppressed. Hence, studies on this η-decay are of high interest in order to test the conservation of the C-parity within the standard model and to search for physics beyond the standard model, e.g., for dark bosons. Since this decay has not yet been observed, only an upper limit of the branching ratio of 4× 10−5 is quoted by the PDG. A huge data set of ≈ 5 × 108 η mesons dedicated for studies on rare and forbidden η-decays has been measured with the WASA-at-COSY setup, which allows for a determination of the relative branching ratio more sensitively than the recent upper limit. The current status of the analysis will be presented and discussed. 1em *Supported by FFE program of the Forschungszentrum Jülich.