Measurement of the charge asymmetry in the decays KoL --> π+/-e+/-ν and KoL --> π+/-μ+/-ν

The charge asymmetry in semi-leptomic K^o_L decays has been measured in a high statistics experiment using multiwire proportional chambers. The asymmetry δ = (N⁺-N^-)/(N⁺+N^-) where N⁺ and N^- are the partial decay rates for K^o_L --> π^-l⁺ν and K^o_L --> π⁺l^-ν, respectively, is found to be δ^e_L = (3.41+/-0.18) × 10^-3 for the K_e3 mode, and δ^μ_L = (3.13+/-0.29) × 10^-3 for the K_μ3 mode. Assuming CPT invariance and the absence of ∆S = -∆Q transitions, these results lead to a value of the real part of the CP-violation parameter ∊, Re ∊ = (1.67+/-0.08) × 10^-3.

Now at Gesamthochschule Siegen, Germany.