Test of theΔS=ΔQRule in Leptonic Decays of NeutralKMesons

We have studied the time distributions of 242 leptonic decays of neutral $K$ mesons produced in the reaction ${K}^{\ensuremath{-}}+p\ensuremath{\rightarrow}{\overline{K}}^{0}+n$. For the $\ensuremath{\Delta}S=\ensuremath{-}\ensuremath{\Delta}Q$ parameter $x$ we find $\mathrm{Re}(x)={0.22}_{\ensuremath{-}0.09}^{+0.07}$, $\mathrm{Im}(x)=\ensuremath{-}0.88\ifmmode\pm\else\textpm\fi{}0.08$.