Measurement of CP asymmetries and branching-fraction ratios for B± → DK± and Dπ± with D → $$ {K}_{\textrm{S}}^0 $$K±π∓ using Belle and Belle II data

Abstract

We measure CP asymmetries and branching-fraction ratios for B±→ DK± and Dπ± decays with D →$$ {K}_{\textrm{S}}^0 $$ K S 0 K±π∓, where D is a superposition of D0 and $$ \overline{D} $$ D ¯ 0. We use the full data set of the Belle experiment, containing 772 × 106$$ B\overline{B} $$ B B ¯ pairs, and data from the Belle II experiment, containing 387 × 106$$ B\overline{B} $$ B B ¯ pairs, both collected in electron-positron collisions at the Υ(4S) resonance. Our results provide model-independent information on the unitarity triangle angle ϕ3.