Dark Matter interpretation of the neutron decay anomaly
Abstract
We add to the Standard Model a new fermion with minimal baryon number 1/3. Neutron decay n into non-relativistic can account for the neutron decay anomaly, compatibly with bounds from neutron stars. can be Dark Matter, and its cosmological abundance can be generated by freeze-in dominated at T mn. The associated processes n γ, hydrogen decay H (γ) and DM-induced neutron disappearance n (γ) have rates below experimental bounds and can be of interest for future experiments.
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