# Measurement of the Weak Axial-Vector Coupling Constant in the Decay of Free Neutrons Using a Pulsed Cold Neutron Beam

## TL;DR

This paper reports a precise measurement of the axial-vector coupling constant in free neutron decay using a novel pulsed cold neutron beam technique, reducing systematic uncertainties and confirming recent results.

## Contribution

First use of a pulsed cold neutron beam for measuring $g_A$, leading to improved systematic control and more precise determination of neutron decay parameters.

## Key findings

- Measured $ ext{g}_A/ ext{g}_V$ with high precision
- Confirmed recent measurements of neutron decay parameters
- Derived implications for CKM matrix and tensor interactions

## Abstract

We present a precision measurement of the axial-vector coupling constant $g_A$ in the decay of polarized free neutrons. For the first time, a pulsed cold neutron beam was used for this purpose. By this method, leading sources of systematic uncertainty are suppressed. From the electron spectra we obtain $\lambda = g_A/g_V = -1.27641(45)_\mathrm{stat}(33)_\mathrm{sys}$ which confirms recent measurements with improved precision. This corresponds to a value of the parity violating beta asymmetry parameter of $A_0 = -0.11985(17)_\mathrm{stat}(12)_\mathrm{sys}$. We discuss implications on the CKM matrix element $V_{ud}$ and derive a limit on left-handed tensor interaction.