Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 8: Hadron Structure and Spectroscopy II
HK 8.7: Vortrag
Montag, 26. Februar 2018, 18:15–18:30, HZO 50
η → π0 e+ e− – Search for C-violation with WASA-at-COSY* — •Kay Demmich, Florian Bergmann, Nils Hüsken, and Alfons Khoukaz for the WASA-at-COSY collaboration — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Germany
By the means of the experimental setup WASA-at-COSY a huge pp→ ppη data set of ≈5×108 η-mesons has been collected, aiming for analyses of rare and forbidden η-decays. This data set allows for studies on C-parity violating reactions like the electromagnetic decay η → π0 e+ e− via a virtual photon, which is forbidden within the standard model. The branching ratio can be determined with a significantly higher sensitivity than the current upper limit of 4×10−5 as quoted by the PDG. Since C-parity conserving higher order processes are highly suppressed, this decay poses a perfect probe to test the conservation laws of the standard model.
Preliminary results of the analysis will be presented and discussed.
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*Supported by FFE program of the Forschungszentrum Jülich.