Measurement of the branching fraction and charge asymmetry of the decay B+ -> D+ D0bar and search for B0 -> D0 D0bar

TL;DR

This paper presents an improved measurement of the branching fraction and charge asymmetry for B+ -> D+ D0bar decays, and sets an upper limit for B0 -> D0 D0bar decays, based on a large dataset collected with the Belle detector.

Contribution

It provides more precise measurements of B+ -> D+ D0bar decay properties and establishes a new upper limit for B0 -> D0 D0bar decay, enhancing understanding of these processes.

Findings

Branching fraction for B+ -> D+ D0bar is (3.85 +- 0.31 +- 0.38) x 10^{-4}

Charge asymmetry for B+ -> D+ D0bar is 0.00 +- 0.08 +- 0.02

Upper limit for B0 -> D0 D0bar is < 0.43 x 10^{-4} at 90% CL

Abstract

We report an improved measurement of the B+ -> D+ D0bar and B0 -> D0 D0bar decays based on 657 10^6 BBar events collected with the Belle detector at KEKB. We measure the branching fraction and charge asymmetry for the B+ -> D+ D0bar decay: B(B+ -> D+ D0bar)=(3.85 +- 0.31 +- 0.38) 10^{-4} and Acp(B+ -> D+ D0bar)=0.00 +- 0.08 +- 0.02, where the first error is statistical and the second is systematic. We also set the upper limit for the B0 -> D0 D0bar decay: B(B0 -> D0 D0bar)< 0.43 10^{-4}at 90% CL.