Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, I. Adachi, L. Aggarwal, H. Aihara, N. Akopov
| Summary:
We present measurements of the branching fractions of eight $overline
B{}^0to D^{(*)+} K^- K^{(*)0}_{(S)}$, $B^{-}to D^{(*)0} K^- K^{(*)0}_{(S)}$
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 $362~text{fb}^{-1}$.
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 $overline B{}^0to D^+K^-K_S^0$, $B^-to D^{*0}K^-K_S^0$, and
$overline B{}^0to D^{*+}K^-K_S^0$ 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 $K^-K_S^0$ systems and
$J^P= 1^+$ for the $K^-K^{*0}$ systems. We also present measurements of the
branching fractions of four $overline B{}^0to D^{(*)+} D_s^-$, $B^{-}to
D^{(*)0} D_s^- $ decay channels with a precision compatible to the current
world averages.
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