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In the Standard Model (SM) we calculate the decay rate of the neutronradiative beta decay to order "O(\alpha^2/\pi^2 ~ 10^{-5})", where "\alpha$"isthe fine--structure constant, and radiative corrections to order "O(\alpha/\pi~ 10^{-3})". The obtained results together with the recent analysis of theneutron radiative beta decay to next-to-leading order in the large proton-massexpansion, performed by Ivanov et al. Phys. Rev. D95, 033007 (2017), describerecent experimental data by the RDK II Collaboration (Bales et al., Phys. Rev.Lett. 116, 242501 (2016)) within 1.5 standard deviations. We argue asubstantial influence of strong low-energy interactions of hadrons coupled tophotons on the properties of the amplitude of the neutron radiative beta decayunder gauge transformations of real and virtual photons.

Precision Theoretical Analysis of Neutron Radiative Beta Decay to Order "O(\alpha^2/\pi^2)"