We present the first measurement of the form factor ratios g1/f1 (direct axial vector to vector), g2/f1 (second class current), and f2/f1 (weak magnetism) for the decay Ξ0 → Σ+ e− ν¯e using the KTeV (E799) beam line and detector at Fermilab. From the Σ+ polarization measured with the decay Σ+ pπ0 and the e− − ν¯ correlation, we measure g1/f1 to be 1.32 ±0.210.17 (stat) ± 0.05 (syst), ssuming the SU (3)f (flavor) values for g2/f1 and f2 / f1. Our results are all consistent with exact SU (3)f symmetry.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)