  We have searched for CP violation in the charmed meson decays $D^{+}_{(s)}\to
K^0_S\pi^+$ and $D^{+}_{(s)}\to K^0_S K^+$ using 673 fb$^{-1}$ of data
collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$
collider. No evidence for CP violation is observed. We report the most
sensitive CP asymmetry measurements to date for these decays: $A_{CP}^{D^+\to
K^0_S\pi^+}=(-0.71\pm0.19\pm0.20)%$, $A_{CP}^{D^+_s\to
K^0_S\pi^+}=(+5.45\pm2.50\pm0.33)%$, $A_{CP}^{D^+\to K^0_S
K^+}=(-0.16\pm0.58\pm0.25)%$, and $A_{CP}^{D^+_s\to K^0_S
K^+}=(+0.12\pm0.36\pm0.22)%$, where the first uncertainties are statistical and
the second are systematic.

High Energy Physics - Experiment