EPJ Web Conf.
Volume 219, 2019International Workshop on Particle Physics at Neutron Sources (PPNS 2018)
|Number of page(s)||4|
|Section||Tests of Gravity, Dark Matter and Dark Energy|
|Published online||12 December 2019|
Dark decay channel analysis (n → χ + e+ e−) with the PERKEO II experiment
1 Technische Universität Wien, Atominstitut, Stadionallee 2, 1020 Wien, Austria
2 Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany
3 Institut Laue-Langevin, CS 20156, 71 avenue des Martyrs, 38042 Grenoble Cedex 9, France
Published online: 12 December 2019
Discrepancies from beam and bottle type experiments measuring the neutron lifetime are on the 4σ level. In recent publications 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 n → χ + e+e−. With data from the Perkeo II experiment we set limits on the branching fraction and exclude a one percent contribution for 96% of the allowed mass range for the dark matter particle. With this publication, we give a detailed description of the experiment and some selected details of the analysis.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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