Source σA D $^{+}$→ K 0 $_{S}$π + CP (%) σA D + s → K 0 $_{S}$π + CP (%) σA D $^{+}$→ K 0 $_{S}$K + CP (%) σA D + s → K 0 $_{S}$K + CP (%) D + s → φπ + statistics 0.18 0.18 - - A D + s → φπ + rec A D + s φπ + rec binning 0.03 0.03 - - M ( K $^{+}$K $^{−}$) window 0.03 0.03 - - D + s → φπ + statistics - - 0.18 0.18 A D + s φπ + rec binning - - 0.03 0.03 M ( K $^{+}$K $^{−}$) window - - 0.03 0.03 A K − ϵ D 0 → K $^{−}$π + statistics - - 0.06 0.06 A K − ϵ binning - - 0.04 0.04 Possible A D $^{0}$→ K $^{−}$π + CP - - 0.01 0.01 cos θ CMS D + ( s ) binning - - 0.06 0.06 Fitting 0.04 0.27 0.12 0.05 K $^{0}$/ ¯ K $^{0}$-material effects 0.06 0.06 0.06 0.06 Total 0.20 0.33 0.25 0.22 TABLE I: Summary of systematic uncertainties. σA CP is the systematic uncertainty in A CP . 5 (0.06%). Systematic uncertainties due to the fitting pro- cedure and K $^{0}$/ ¯ K $^{0}$-material effects are described above and included in Table I, where the total systematic un- certainties of the A$_{CP}$ measurements are summarized. Combining all systematic uncertainties in quadrature, we obtain A D $^{+}$→ K 0 $_{S}$K + CP = ( − 0 . 16 ± 0 . 58 ± 0 . 25)% and A D + s → K 0 $_{S}$K + CP = (+0 . 12 ± 0 . 36 ± 0 . 22)% where the first un- certainties are statistical and the second are systematic. Table II summarizes our results, present best measure- ments [15], and expected A$_{CP}$ from K $^{0}$− ¯ K 0 mixing [3]. e $^{+}$e − collider, we have searched for CP violation in the charged charmed meson decays D + ( s ) → K 0 $_{S}$π + and D + ( s ) → K 0 $_{S}$K $^{+}$. No evidence for CP violation is ob- served. Our results are consistent with the SM (see Ta- ble II) and provide the most stringent constraints to date on models for beyond the SM CP violation in these de- cays [5]. We thank the KEKB group for excellent operation of the accelerator, the KEK cryogenics group for efficient solenoid operations, and the KEK computer group and the NII for valuable computing and SINET3 network sup- port. We acknowledge support from MEXT, JSPS and Nagoya’s TLPRC (Japan); ARC and DIISR (Australia); NSFC (China); DST (India); MEST, KOSEF, KRF (Ko- rea); MNiSW (Poland); MES and RFAAE (Russia); ARRS (Slovenia); SNSF (Switzerland); NSC and MOE (Taiwan); and DOE (USA). In summary, with a 673 fb − 1 data sample collected with the Belle detector at the KEKB asymmetric-energy [1] M. Kobayashi and T. Maskawa, Prog. Theor. Phys., 49 , 652 (1973). [2] F. Buccella, M. Lusignoli, G. Miele, A. Pugliese, and P. Santorelli, Phys. Rev. D 51 , 3478 (1995). FIG. 3: Measured A CP and A FB values for D + ( s ) → K 0 $_{S}$K + as a function of | cos θ CMS D + ( s ) | . The dashed curves show the leading- order prediction for A c ¯ c $_{FB}$. Belle (%) Ref. [15] (%) Ref. [3] (%) A D $^{+}$→ K 0 $_{S}$π + CP − 0 . 71 ± 0 . 19 ± 0 . 20 − 1 . 3 ± 0 . 7 ± 0 . 3 − 0 . 332 † A D + s → K 0 $_{S}$π + CP +5 . 45 2 . 50 0 . 33 +16 . 3 7 . 3 0 . 3 +0 . 332 A D $^{+}$→ K 0 $_{S}$K + CP − 0 . 16 ± 0 . 58 ± 0 . 25 − 0 . 2 ± 1 . 5 ± 0 . 9 − 0 . 332 A D + s → K 0 $_{S}$K + CP +0 . 12 0 . 36 0 . 22 +4 . 7 1 . 8 0 . 9 0 . 332 † TABLE II: Summary of the A CP measurements. The first uncertainties in the second and third columns are statistical and the second are systematic. DCS decay contributions are ignored for the decays denoted by † ’s in the fourth column. 0 0.2 0.4 0.6 0.8 1 CP + K S 0  K + D A −0.04 −0.02 0 0.02 0.04 | + D CMS |cos 0 0.2 0.4 0.6 0.8 1 FB + K S 0  K + D A −0.06 −0.04 −0.02 0 0.02 0 0.2 0.4 0.6 0.8 1 CP + K S 0  K s + D A −0.04 −0.02 0 0.02 0.04 | s + D CMS |cos 0 0.2 0.4 0.6 0.8 1 FB + K S 0  K s + D A −0.06 −0.04 −0.02 0 0.02