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We analyse the discrepancy between the neutron lifetimes measured in thebottle and beam experiments. Following Fornal and Grinstein (Phys. Rev. Lett.120, 191801 (2018)) we propose an explanation of such a puzzle by the darkmatter channels of the neutron decay. However, unlike Fornal and Grinstein inaddition to the dark matter decay channel n -> \chi + e^- + e^+, where \chi isa dark matter Dirac fermion and (e^-e^+) is an electron--positron pair, weassume the existence of the dark matter channel n -> chi + \nu_e + \bar{\nu}_e,where \nu_e \bar{\nu}_e is the electron neutrino-antineutrino pair. This allowsto describe the discrepancy between the measurements of the neutron lifetimeeven in case of an unobservability of the dark matter decay channel n -> \chi +e^- + e^+, which may be below the reaction threshold. The existence of thecoupling n -> \chi + e^- + e^+ can be observed experimentally by measuringelectron-neutron scattering e^- + n -> \chi + e^- at very low electronenergies, induced with the strength as of the decay n -> \chi + \nu_e +\bar{\nu}_e$. We propose a gauge invariant quantum field theory model withSU_L(2)\times U_R(1) \times U_R'(1)\times U''_L(1) symmetry for the UVcompletion of the effective (n\chi \ell \bar{\ell}) interaction, where\ell(\bar{\ell}) is electron (positron) or neutrino(antineutrino).

Neutron Dark Matter Decays