First evidence for the annihilation decay mode B^+ to D_s^+ ϕ

Evidence for the hadronic annihilation decay mode B+→D+sϕ is found with greater than 3σ significance. The branching fraction and \CP asymmetry are measured to be \mathcal{B}(B^{+} \to D_s^{+}\phi) &=& (1.87^{+1.25}_{-0.73}({\rm stat}) \pm 0.19 ({\rm syst}) \pm 0.32 ({\rm norm})) \times 10^{-6}, \mathcal{A}_{CP}(B^{+} \to D_s^{+}\phi) &=& -0.01 \pm 0.41 ({\rm stat}) \pm 0.03 ({\rm syst}). The last uncertainty on B(B+→D+sϕ) is from the branching fractions of the B+→D+sDˉ0 normalization mode and intermediate resonance decays. Upper limits are also set for the branching fractions of the related decay modes B+(c)→D+(s)K∗0, B+(c)→D+(s)Kˉ∗0 and B+c→D+sϕ, including the result {\mathcal{B}(B^+ \to D^+ K^{*0})} < 1.8 \times 10^{-6} at the 90% credibility level.
Evidence for the hadronic annihilation decay mode is found with greater than 3σ significance. The branching fraction and CP asymmetry are measured to be