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Evidence for the hadronic annihilation decay mode $B^{+} \to D_s^{+}\phi$ isfound with greater than $3\sigma$ significance. The branching fraction and \CPasymmetry 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 $\mathcal{B}(B^{+}\to D_s^{+}\phi)$ is from the branching fractions of the $B^+ \to D_s^+ \kern0.2em\bar{\kern -0.2em D}{}^0$ normalization mode and intermediate resonancedecays. Upper limits are also set for the branching fractions of the relateddecay modes $B^{+}_{(c)} \to D^{+}_{(s)} K^{*0}$, $B^{+}_{(c)} \to D^{+}_{(s)}\kern 0.2em\bar{\kern -0.2em K}{}^{*0}$ and ${B_c^{+} \to D^{+}_{s}\phi}$,including the result ${\mathcal{B}(B^+ \to D^+ K^{*0})} < 1.8 \times 10^{-6}$at the 90% credibility level.

First evidence for the annihilation decay mode $B^{+} \to D_{s}^{+} \phi$