Measurement of the angular correlation parameters in the β decay of polarized Λ hyperons

We present our final results from an experimental investigation of the β decay of polarized Λ hyperons with a large-aperture magnetic spectrometer. Our data sample consists of 544 events. We obtain A/sub ν/A/sub e/ = 0.05 +- 0.12, and A/sub p/ = -0.47 +- 0.12 for the three spin-asymmetry parameters, and A/sub e/sub ν//for the electron-neutrino correlation. The lepton-plane correlation with the Λ spin, D = 0.11 +- 0.20, is consistent with no violation of time-reversal invariance. Our data yield an axial-vector-to-vector form-factor ratio of g1/f1 = 0.53/sup +0.22//sub -0.09/. The Cabibbo-model value is g1/f1 = 0.71