Overview of Neutron Beta Correlation Parameter Analysis from the UCNA Experiment

The UCNA experiment, operated at the Ultracold Neutron Facility at the Los Alamos Neutron Science Center, uses ultracold neutrons (UCN) to measure the free-neutron $\beta$-decay correlation parameter, $A$, between the neutron spin direction and $\beta$ momentum direction. Measurements of $A$ presently provide the most precise value of $g_A/g_V$, the ratio of the axial-vector and vector coupling constants of the nucleon weak interaction. The UCNA experiment has previously analyzed and reported on a measurement of $A$ from a 2010 dataset. Additional datasets were also taken in 2011-2012 and 2012-2013. Improvements in energy calibrations, polarimetry, and statistics are expected to provide a more precise measurement of $A$ from the later datasets. We provide a review of the experimental apparatus and give an updated overview on the state of the 2011-2012 and 2012-2013 dataset analysis with respect to the $A$ measurement.