Search for Violation in the Decay → with WASA-at-COSY
P. Adlarson (Division of Nuclear Physics, Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden); W. Augustyniak (Department of Nuclear Physics, National Centre for Nuclear Research, Warsaw, Poland); W. Bardan (Institute of Physics, Jagiellonian University, Kraków, Poland); M. Bashkanov (School of Physics and Astronomy, University of Edinburgh, James Clerk Maxwell Building, Edinburgh, United Kingdom of Great Britain and Northern Ireland); F.S. Bergmann (Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany); et al - Show all 92 authors
We report on the search for the rare decay which is of interest to study C violation in the electromagnetic interaction which would indicate contributions from physics beyond the Standard Model, since the allowed decay via a two-photon intermediate state is strongly suppressed. The experiment has been performed using the WASA-at-COSY installation, located at the COSY accelerator of the Forschungszentrum Jülich, Germany. In total events of the reaction have been recorded at an excess energy of . Based on this data set the C parity violating decay via a single-photon intermediate state has been searched for, resulting in new upper limits of and (), respectively.