Measurement of the branching fractions of (<i>B</i>)over-bar → <i>D</i>(*)<i>K</i><SUP>-</SUP><i>K</i><SUP>(</SUP>*<SUP>)0</SUP><sub>(<i>S</i>)</sub> and (<i>B</i>)over-bar → <i>D</i>(*)<i>D</i><SUP>-</SUP><i><sub>s</sub></i> decays at Belle II
Description
We present measurements of the branching fractions of eight (B) over bar -> (D(*)+K-K()*()0)((S)), B- -> D-(*(K-K()-K-)0*()0)((S)) decay channels. The results are based on data from SuperKEKB electron-positron collisions at the Upsilon(4S) resonance collected with the Belle II detector, corresponding to an integrated luminosity of 362 fb(-1). The event yields are extracted from fits to the distributions of the difference between expected and observed B meson energy, and are efficiency-corrected as a function of m((K-K()*()0)((S))) and m(D-(*K-)(()*()0)((S))) in order to avoid dependence on the decay model. These results include the first observation of (B) over bar (0) -> (D+K-KS0), B- -> D*(K-KS0)-K-0, and (B) over bar (0) -> D*(+K-KS0) decays and a significant improvement in the precision of the other channels compared to previous measurements. The helicity-angle distributions and the invariant mass distributions of the (K-K()*()0)((S)) systems are compatible with quasi-two-body decays via a resonant transition with spin-parity J(P) = 1(-) for the (K-KS0) systems and J(P) = 1(+) for the K-K*(0) systems. We also present measurements of the branching fractions of four (B) over bar (0) -> D-(*D-)+(s)-, B- -> D-(*D-)0(s)- decay channels with a precision compatible to the current world averages.
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