Measurement of $D^{+}\to K_S^0{K}^{+}$ and $D_s^{+}\to K_S^0{\pi }^{+}$ branching ratios

Abstract

We report an improved measurement of $D^{+}\to K_S^0{K}^{+}$ and $D_s^{+}\to K_S^0{\pi }^{+}$ branching ratios using 605 fb${}^{-1}$ of data collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. The measured branching ratios with respect to the Cabibbo-favored modes are $\mathcal{B}(D^{+}\to K_S^0{K}^{+})/\mathcal{B}(D^{+}\to K_S^0{\pi }^{+})$ = 0.1899$\pm 0.0011\pm$0.0022 and $\mathcal{B}(D_s^{+}\to K_S^0{\pi }^{+})/\mathcal{B}(D_s^{+}\to K_S^0{K}^{+})$ = 0.0803$\pm 0.0024\pm$0.0019 where the first uncertainties are statistical and the second are systematic.