Search for CP Violation in the Decays D_(s)~+ → K_s~0π~+ and D_(s)~+ → K_s~0K~+

摘要

We have searched for CP violation in the charmed meson decays D_(s)~+ → K_S~0π~+ and D_(s)~+ → K_S~0K~+ 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+→K_S~0π~+) = (-0.71 ± 0.19 ± 0.20)%, A_(CP)~(D_S~+→K_s~0π~+) = (+5.45 ± 2.50 ± 0.33)%, A_(CP)~(D~+→K_s~0K~+) = (-0.16 ±0.58 ±0.25)%, and A_(CP)~(D_s~+→K_s~0K~+) = (+0.12 ± 0.36 ± 0.22)%, where the first uncertainties are statistical and the second are systematic.