Analysis of direct CP violation in B- → D⁰ Dₛ-, D⁰ D- decays

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We investigate the possibility of observing the direct CP violation in the decay modes B- → D⁰ Dₛ- and D⁰ D- within the Standard Model. Including the contributions arising from the tree, annihilation, QCD as well as electroweak penguins with both time- and space-like components, we find that the direct CP asymmetry in B- → D⁰ Dₛ- is very small 0.2 % but in B- → D⁰ D- decay it can be as large as 4%. Approximately 10⁷ charged B mesons are required to experimentally observe the CP asymmetry parameter for the later case. Since this is easily accessible with the currently running B factories, the decay mode B- → D⁰ D- may be pursued to look for CP violation.