Constraints on the Dark Matter Interpretation nχ+e+e of the Neutron Decay Anomaly with the PERKEO II Experiment

Klopf, M. (Atominstitut, Technische Universität Wien, Stadionallee 2, 1020 Wien, Austria) ; Jericha, E. (Atominstitut, Technische Universität Wien, Stadionallee 2, 1020 Wien, Austria) ; Märkisch, B. (Physik-Department ENE, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany) ; Saul, H. (Physik-Department ENE, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany) (Atominstitut, Technische Universität Wien, Stadionallee 2, 1020 Wien, Austria) ; Soldner, T. (Institut Laue-Langevin, BP 156, 6, rue Jules Horowitz, 38042 Grenoble Cedex 9, France) ; Abele, H. (Atominstitut, Technische Universität Wien, Stadionallee 2, 1020 Wien, Austria)

07 June 2019

Abstract: Discrepancies from in-beam- and in-bottle-type experiments measuring the neutron lifetime are on the 4σ standard deviation level. In a recent publication Fornal and Grinstein proposed that the puzzle could be solved if the neutron would decay on the one percent level via a dark decay mode, one possible branch being nχ+e+e. With data from the Perkeo II experiment we set limits on the branching fraction and exclude a one percent contribution for 95% of the allowed mass range for the dark matter particle.


Published in: Physical Review Letters 122 (2019)
Published by: APS
DOI: 10.1103/PhysRevLett.122.222503
License: CC-BY-4.0



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