Determination of Cabibbo Parameters from Leptonic Baryon Decay

Abstract

The parameters $D$, $F$, and $\theta$ appearing in Cabibbo's theory for the weak baryon current have been reevaluated, following Willis et al., using the latest available data on the leptonic decays of baryons. The momentum dependence of the form factors has been included. Seven data were used and three parameters fitted. The best least-squares fit to the data gives $D=-0.766\mathrm{}\pm 0.037$, $F=-0.415\mathrm{}\pm 0.035$, $\theta =0.245\mathrm{}\pm 0.010$ [probability=93% (${\chi }^2=0.78\mathrm{}$)].