A test of the Δ S =Δ Q selection rule in K e3 0 decay

A test of the ΔS=ΔQ selection rule in K μ3 0 decay was performed using optical spark chambers. K0-mesons were produced by 3 GeV/c π− in the reaction π−p→ΛK0. 100 events with proper decay times between 0.5 and 6.5 K s 0 lifetimes were analysed to give a ratio of the ΔS=−ΔQ to ΔS=ΔQ amplitudes Rex′=0.04 −0.13 +0.10 , Imx′=0.12 −0.16 +0.17 .