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Constraints on the Dark Matter Interpretation $n \rightarrow \chi + e^+ e^-$ of the Neutron Decay Anomaly with the PERKEO II experiment

Authors
  • Klopf, M.
  • Jericha, E.
  • Märkisch, B.
  • Saul, H.
  • Soldner, T.
  • Abele, H.
Publication Date
May 29, 2019
Source
HAL
Keywords
Language
English
License
Unknown
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Abstract

Discrepancies from in-beam and in-bottle type experiments measuring the neutron lifetime are on the 4$\sigma$ 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 $n \rightarrow \chi + e^+ e^-$. With data from the \perkeoII 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.

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