TL;DR
This paper reviews the hypothesis that neutron lifetime discrepancies may be due to neutron decaying into dark particles, exploring models, theoretical developments, and experimental prospects for verification.
Contribution
It provides a comprehensive overview of models and theories supporting neutron dark decay and discusses experimental strategies to test this hypothesis.
Findings
Current experiments have not confirmed neutron dark decay.
Theoretical models suggest possible portals to a baryonic dark sector.
Upcoming experiments may provide definitive tests for the hypothesis.
Abstract
The existing discrepancy between neutron lifetime measurements in bottle and beam experiments has been interpreted as a sign of the neutron decaying to dark particles. We summarize the current status of this proposal, including a discussion of particle physics models involving such a portal between the Standard Model and a baryonic dark sector. We also review further theoretical developments around this idea and elaborate on the prospects for verifying the neutron dark decay hypothesis in current and upcoming experiments.
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