MEASUREMENT OF AXIAL-VECTOR TO VECTOR COUPLING CONSTANT [G1/F1] IN SIGMA--]NE-VBAR DECAY

The ratio of the axial-vector to vector coupling constant, |g1/f1|, in the Σ-→ne- {Mathematical expression} decay was determined from the electron-neutrino angular distribution. In a sample of 454 Σ-→ne- {Mathematical expression} decays a search was made for subsequent neutron proton scattering in order to detect the decay neutrons. The Σ hyperons were produced by stopping K--mesons in the 81 cm Saclay hydrogen bubble chamber. For the kinematical analysis 33 Σ-→ne-ν events with associated np→np interactions were accepted. The value |g1/f1|=0.37-0.19+0.26 was obtained. © 1969 Springer-Verlag.