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

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 $n\to \chi +e^{+}{e}^{-}$. 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.

arXiv comment5 pages, 2 figures

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• Search for a neutron dark decay in ${}^6$He
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• Neutron-neutral particle mixing and its observable consequences
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• New Physics Searches at Kaon and Hyperon Factories
• Particles in finite volumes and a toy model of decaying neutrons