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

Abstract : Evidence for the hadronic annihilation decay mode $B^{+} \to D_s^{+}\phi$ is found with greater than $3\sigma$ 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 $\mathcal{B}(B^{+} \to D_s^{+}\phi)$ is from the branching fractions of the $B^+ \to D_s^+ \kern 0.2em\bar{\kern -0.2em D}{}^0$ normalization mode and intermediate resonance decays. Upper limits are also set for the branching fractions of the related decay 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.
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Journal articles

http://hal.in2p3.fr/in2p3-00789562
Contributor : Sabine Starita <>
Submitted on : Monday, February 18, 2013 - 2:57:25 PM
Last modification on : Thursday, February 25, 2021 - 10:58:32 AM

### Citation

R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. First evidence for the annihilation decay mode $B^{+} \to D_{s}^{+} \phi$. Journal of High Energy Physics, Springer, 2013, 02, pp.043. ⟨10.1007/JHEP02(2013)043⟩. ⟨in2p3-00789562⟩

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