As we have pointed out in (arXiv:1806.10107 [hep-ph]), the existence of neutron dark matter decay modesn→χ+anything, whereχis a dark matter fermion, for the solution of the neutron lifetime problem changes priorities and demands to describe the neutron lifetimeτn=888.0(2.0)s, measured in beam experiments and defined by the decay modesn→p+anything, in the Standard Model (SM). The latter requires the axial coupling constantλto be equal toλ=?1.2690(arXiv:1806.10107 [hep-ph]). Since such an axial coupling constant is excluded by experimental data reported by the PERKEO II and UCNA Collaborations, the neutron lifetimeτn=888.0(2.0)scan be explained only by virtue of interactions beyond the SM, namely, by the Fierz interference term of orderb～?10?2dependent on scalar and tensor coupling constants. We give a complete analysis of all correlation coefficients of the neutronβ?-decays with polarized neutron, taking into account the contributions of scalar and tensor interactions beyond the SM with the Fierz interference termb～?10?2. We show that the obtained results agree well with contemporary experimental data that does not prevent the neutron with the rate of the decay modesn→p+anything, measured in beam experiments, to have dark matter decay modesn→χ+anything.
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