New Possibilities for Measuring the Ratio of the Axial and Vector Weak Interaction Constants

A. P. Serebrov; Серебров А. П.; O. M. Zherebtsov; Жеребцов О. М.; G. N. Klyushnikov; Клюшников Г. Н.; A. O. Koptyukhov; Коптюхов А. О.; A. R. Moroz; Мороз А. Р.; A. N. Murashkin; Мурашкин А. Н.; A. K. Fomin; Фомин А. К.

doi:10.31857/S1028096023040179

New Possibilities for Measuring the Ratio of the Axial and Vector Weak Interaction Constants

Authors: Serebrov A.P.¹, Zherebtsov O.M.¹, Klyushnikov G.N.¹, Koptyukhov A.O.¹, Moroz A.R.¹, Murashkin A.N.¹, Fomin A.K.¹
Affiliations:
1. Petersburg Nuclear Physics Institute named by B.P. Konstantinov, National Research Center “Kurchatov Institute”
Issue: No 4 (2023)
Pages: 35-49
Section: Articles
URL: https://rjsvd.com/1028-0960/article/view/664576
DOI: https://doi.org/10.31857/S1028096023040179
EDN: https://elibrary.ru/KCIPQV
ID: 664576

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Abstract

An experiment is being developed to determine the value of λ, the ratio of the axial weak interaction constant G_A to the vector constant G_V, by simultaneously measuring the electron (A) and neutrino (B) asymmetries of β-decay on the same setup. The λ measurement is based on the ratio: λ = (A – B)/(A + B). Simultaneous measurements of A and B on the same setup are suggested to be carried out using ultracold neutrons stored in the magnetic field of a superconducting solenoid. The proposed method for determining λ, firstly, makes it possible to neglect the contribution of the Firtz interference term, and, secondly, eliminates the need for accurate measurement of the neutron polarization. The presented method allows us to measure the λ value with a precision of 10^–4.

Keywords

standard model, weak interaction, neutron β-decay asymmetry, ultracold neutrons.

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