Summary: | 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 β−–decays for polarized neutrons, polarized electrons and unpolarized protons. The strength of contributions of pseudoscalar interactions is defined by the effective coupling constant Cps=Cps(OPP)+Cps(BSM). We show that the contribution of the OPP exchange is of order Cps(OPP)∼−10−5. The effective coupling constant Cps(BSM) of the pseudoscalar interaction BSM can be in principle complex. Using the results, obtained by González-Alonso et al. (2019) [34] we find that the values of the real and imaginary parts of the effective coupling constant Cps(BSM) are constrained by −3.5×10−5<ReCps(BSM)<0 and ImCps(BSM)<−2.3×10−5, respectively. The obtained results can be used as a theoretical background for experimental searches of contributions of interactions BSM in asymmetries of the neutron β−–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].
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