Measurement of the Branching Fractions for the Exclusive Decays of B0 and B+ to Dbar(*)D(*)K

TL;DR

This paper reports precise measurements of the branching fractions for all 22 exclusive decay modes of B0 and B+ mesons into Dbar(*)D(*)K final states, using data from the BaBar detector.

Contribution

It provides the first comprehensive measurement of all exclusive B decays to Dbar(*)D(*)K, including their branching fractions, with improved precision.

Findings

Branching fraction for B0 to Dbar(*)D(*)K is approximately 4.3%.

Branching fraction for B+ to Dbar(*)D(*)K is approximately 3.5%.

All 22 decay modes were reconstructed and analyzed.

Abstract

Using data collected with the babar detector between 1999 and 2002, we report the observation of 823+-57 B0 and 969+-65 B+ decays to Dbar(*)D^(*)K, where Dbar(*) and D(*) are fully reconstructed and where K is either a K+ or a K0_S decaying to pi+pi-. All 22 possible B decays to Dbar(*)D(*)K are reconstructed exclusively and the corresponding branching fractions or limits are determined. The preliminary branching fractions of the B0 and of the B+ to Dbar(*)D^(*)K are found to be Br(B0->Dbar(*)D^(*)K)=(4.3+-0.3(stat)+-0.6 (syst))10^-2 Br(B+->Dbar(*)D^(*)K)=(3.5+-0.3(stat)+-0.5 (syst))10^-2