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In the framework of the Standard Model (SM) a theoretical description of theneutron beta decay is given at the level of 10^{-5}. The neutron lifetime andcorrelation coefficients of the neutron beta decay for a polarized neutron, apolarized electron and an unpolarized proton are calculated at the account fori) the radiative corrections of order O(\alpha E_e/m_N) ~ 10^{-5} to Sirlin'souter and inner radiative corrections of order O(\alpha/\pi), ii) thecorrections of order O(E^2_e/m^2_N) ~ 10^{-5}, caused by weak magnetism andproton recoil, and iii) Wilkinson's corrections of order 10^{-5} (Wilkinson,Nucl. Phys. A377, 474 (1982)). These corrections define the SM background ofthe theoretical description of the neutron beta decay at the level of 10^{-5},which is required by experimental searches of interactions beyond the SM withexperimental uncertainties of a few parts of 10^{-5}.

Theoretical description of the neutron beta decay in the standard model at the level of 10^{-5}