Measurement of the Alpha Asymmetry Parameter for the Omega- to Lambda K- Decay

TL;DR

This paper reports a precise measurement of the alpha asymmetry parameter in the decay of Omega- to Lambda K-, providing insights into hyperon decay asymmetries.

Contribution

First measurement of the alpha parameter for Omega- to Lambda K- decay using Fermilab HyperCP data, with detailed analysis and error estimation.

Findings

Measured alpha_Omega*alpha_Lambda = (1.33±0.33±0.52) x 10^{-2}

Determined alpha_Omega = (2.07±0.51±0.81) x 10^{-2}

Enhanced understanding of hyperon decay asymmetries.

Abstract

We have measured the alpha parameter of the Omega- to Lambda K- decay using data collected with the HyperCP spectrometer during the 1997 fixed-target run at Fermilab. Analyzing a sample of 0.96 million Omega- to Lambda K^-, Lambda to p pi- decays, we obtain alpha_Omega*alpha_Lambda = [1.33+/-0.33(stat)+/-0.52(syst)] x 10^{-2}. With the accepted value of alpha_Lambda, alpha_Omega is found to be [2.07+/-0.51(stat)+/-0.81(syst)] x 10^{-2}.