Key points are not available for this paper at this time.
A bstract We report results from a study of B ± → DK ± decays followed by D decaying to the CP -even final state K + K − and CP-odd final state KS⁰⁰ K S 0 π 0, where D is an admixture of D 0 and D⁰ D ¯ 0 states. These decays are sensitive to the Cabibbo-Kobayashi-Maskawa unitarity-triangle angle ϕ 3. The results are based on a combined analysis of the final data set of 772 × 10 6 BB B B ¯ pairs collected by the Belle experiment and a data set of 198 × 10 6 BB B B ¯ pairs collected by the Belle II experiment, both in electron-positron collisions at the Υ (4 S) resonance. We measure the CP asymmetries to be A A CP + = (+12. 5 ± 5. 8 ± 1. 4) % and A A CP− = (− 16. 7 ± 5. 7 ± 0. 6) %, and the ratios of branching fractions to be R R CP + = 1. 164 ± 0. 081 ± 0. 036 and R R CP− = 1. 151 ± 0. 074 ± 0. 019. The first contribution to the uncertainties is statistical, and the second is systematic. The asymmetries A A CP + and A A CP− have similar magnitudes and opposite signs; their difference corresponds to 3. 5 standard deviations. From these values we calculate 68. 3% confidence intervals of (8. 5 ° < ϕ 3 < 16. 5 °) or (84. 5 ° < ϕ 3 < 95. 5 °) or (163. 3 ° < ϕ 3 < 171. 5 °) and 0. 321 < r B < 0. 465.
Adachi et al. (Fri,) studied this question.