Study of $B\to D^{(\ast )}h$ decays using $62.8{\mathrm{fb}}^{-1}$ of Belle II data

Abstract

We report measurements related to hadronic $B$ decays to final states that contain charm mesons. The analyses are performed on a $62.8{\mathrm{fb}}^{-1}$ data set collected by the Belle II experiment at a center-of-mass energy corresponding to the mass of the $\hat{I}\yen (4S)$ resonance. The measurements reported are for the decay modes $B^{-}\to D^0{h}^{-}$, $B^{-}\to D^{\ast 0}{h}^{-}$, ${\bar{B}}^0\to D^{+}{h}^{-}$ and ${\bar{B}}^0\to D^{\ast +}{h}^{-}$, where $h=\ddot{I}€$ or $K$. These modes are either signal or control channels for measurements related to the unitarity triangle angle ${\hat{I}}^3$ in direct or time-dependent $CP$-violation measurements. The reported observables are the ratios between the $B\to D^{(\ast )}K$ and $B\to D^{(\ast )}\ddot{I}€$ decay rates, which are found to be in agreement with previous measurements.

19 pages, 5 figures, Moriond QCD