Precision analysis of pseudoscalar interactions in neutron beta decays

We analyze the contributions of the one-pion-pole (OPP) exchange, caused by strong low-energy interactions, and the pseudoscalar interaction beyond the Standard Model (BSM) to the correlation coefficients of the neutron beta(-)-decays for polarized neutrons, polarized electrons and unpolarized protons. The strength of contributions of pseudoscalar interactions is defined by the effective coupling constant C-ps = Cps(OPP) +Cps(BSM). We show that the contribution of the OPP exchange is of order C-ps((OPP) )similar to -10(-5). The effective coupling constant C-ps((BSM)) of the pseudoscalar interaction BSM can be in principle complex. Using the results, obtained by Gonzalez-Alonso et al. (2019) [34] we find that the values of the real and imaginary parts of the effective coupling constant C-ps((BSM)) are constrained by -3.5 x 10(-5) < ReCps(BSM) <0andIm C-ps((BSM)) < -2.3 x 10(-5), respectively. The obtained results can be used as a theoretical background for experimental searches of contributions of interactions BSM in asymmetries of the neutron beta(-)-decays with a polarized neutron, a polarized electron and an unpolarized proton at the level of accuracy of a few parts of 10(-5) or even better Abele (2016) [40]. (C) 2019 The Author(s). Published by Elsevier B.V.