Precision analysis of pseudoscalar interactions in neutron beta decays
Abstract
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 = C^(OPP)_ps + C^(BSM)_ps. We show that the contribution of the OPP exchange is of order C^(OPP)_ps ~ - 10^(-5). The effective coupling constant C^(BSM)_ps of the pseudoscalar interaction BSM can be in principle complex. Using the results, obtained by Gonzalez-Alonso et al.( Prog. Part. Nucl. Phys. 104, 165 (2019)) we find that the values of the real and imaginary parts of the effective coupling constant C^(BSM)_ps are constrained by - 3.5x10^{-5} < ReC^(BSM)_ps < 0 and ImC^(BSM)_ps < - 2.3x10^(-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 or even better (Abele, Hyperfine Interact.237, 155 (2016)).
Keywords
Cite
@article{arxiv.1905.04147,
title = {Precision analysis of pseudoscalar interactions in neutron beta decays},
author = {A. N. Ivanov and R. Höllwieser and N. I. Troitskaya and M. Wellenzohn and Ya. A. Berdnikov},
journal= {arXiv preprint arXiv:1905.04147},
year = {2020}
}
Comments
12 pages, the paper is fully revised and accepted for publication in Nuclear Physics B