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Heidelberg 2015 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 48: Poster

HK 48.9: Poster

Wednesday, March 25, 2015, 17:00–19:00, C/Foyer

Investigations of η → π0 e+ e with WASA-at-COSY in the light of C-violation and physics beyond SM* — •Kay Demmich, Florian Bergmann, Nils Hüsken, Karsten Sitterberg, and Alfons Khoukaz for the WASA-at-COSY collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Germany

The decay η → π0 e+ e is a perfect probe for testing the conservation of the C-parity within the standard model and for the search of dark U-bosons. This reaction has not been observed so far and only an upper limit of the branching ratio of 4× 10−5 is quoted by the PDG. With the WASA-at-COSY facility a huge data set of ≈ 5 × 108 η mesons has been produced in proton-proton scattering dedicated for studies on rare and forbidden decays of the η meson. This high statistics measurement allows for the determination of the relative branching ratio below the recent upper limit and is sensitive to small C-violating and dark matter contributions. The current status of the analysis will be presented and discussed. 1em *Supported by FFE program of the Forschungszentrum Jülich.

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