Search for CP Violation in the Decay $D^{+}\to K_S^0{K}^{+}$

We search for CP violation in the decay $D^{+}\to K_S^0{K}^{+}$ using a data sample with an integrated luminosity of 977 fb^-1 collected with the Belle detector at the KEKB e⁺e^- asymmetric-energy collider. No CP violation has been observed and the CP asymmetry in $D^{+}\to K_S^0{K}^{+}$ decay is measured to be (-0.25±0.28±0.14), which is the most sensitive measurement to date. After subtracting CP violation due to $K^0$-${\overline{K}}^0$ mixing, the CP asymmetry in $D^{+}$→${\overline{K}}^0$$K^{+}$ decay is found to be (+0.08±0.28±0.14).