Observation of $B^0 \to D^+ D^-$, $B^- \to D^0 D^-$ and $B^- \to D^0 D^{*-}$ decays

TL;DR

This paper reports the first observation of three specific B meson decay modes into D mesons, measuring their branching fractions and finding no significant charge asymmetries, based on a large dataset from KEKB.

Contribution

First observation of B^0 to D^+ D^-, B^- to D^0 D^-, and B^- to D^0 D^{*-} decays with measured branching fractions and charge asymmetries.

Findings

Branching fractions measured with uncertainties.

Charge asymmetries consistent with zero.

First observation of these decay modes.

Abstract

We report the first observation of the decay modes $B^0 \to D^+ D^-$, $B^- \to D^0 D^-$ and $B^- \to D^0 D^{*-}$ based on 152 $\times$ 10$^6$ $B\bar{B}$ events collected at KEKB. The branching fractions of $B^0 \to D^+ D^-$, $B^- \to D^0 D^-$ and $B^- \to D^0 D^{*-}$ are found to be $(3.21 \pm 0.57 \pm 0.48) \times 10^{-4}$, $(5.62 \pm 0.82 \pm 0.65) \times 10^{-4}$ and $(4.59 \pm 0.72 \pm 0.56) \times 10^{-4}$, respectively. Charge asymmetries in the $B^- \to D^0 D^-$ and $B^- \to D^0 D^{*-}$ channels are consistent with zero.