CP violation with B 0 s → D̄ 0 φ decays

We note that it is possible to determine the weak phase γ from the time dependent measurements of the decays B0 s (t)(B̄ 0 s (t)) → D̄0φ without any hadronic uncertainties. These decays are described by the color suppressed tree diagrams and hence are free from the penguin pollutions. We further demonstrate that γ can also be extracted with no hadronic uncertainties from an angular analysis of corresponding vector vector modes, B0 s (t)(B̄ 0 s (t)) → D̄∗0φ. Although the branching ratios for these decay modes are quite small O(10−5− 10−6), the strategies presented here appear to be particularly interesting for the “second generation” experiments at hadronic B factories. Typeset using REVTEX 1