The decays - ne-», - e-» (-p), and e-» (-p) were studied using unpolarized hyperons from the Yale-Fermilab-BNL hyperon beam at the Brookhaven National Laboratory Alernating Gradient Synchrotron. The -, -, e-, and -decay-product momenta were measured by magnetic spectrometers with magnetostrictive wire spark chambers. A threshold Cerenkov counter and a total absorption calorimeter identified the electron and neutron, respectively. From a sample of 3507 reconstructed - ne-» events we have found gAgV=0.4350.035. From a sample of 55 reconstructed e-» events we have found gVgA=-0.170.35 assuming that the conserved vector current hypothesis correctly predicts the weak magnetic form factor. A new one-angle Cabibbo fit gives f=0.4360.010, d=0.8120.011, and,=0.2320.003 radian.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)