Determination of Cabibbo Parameters from Baryon Decays

Abstract

A comparison is made of Cabibbo theory to the experimental data on semileptonic hyperon decays. With a confidence level of 89%, the results are that the Cabibbo angle $\theta$ is 0.206±0.009, the weak $\frac{D}{F}$ ratio $\alpha$ is 0.662±0.018, and the strangeness-changing axial-vector renormalization $\xi$ is 1.42±0.10.