Study of Charmless Decays $B^{\pm } \rightarrow K^0_{\scriptscriptstyle S} K^0_{\scriptscriptstyle S} h^{\pm }$ ($h=K,\pi$) at Belle

Abstract

We report a search for charmless hadronic decays of charged B mesons to the final states $K^0_{\scriptscriptstyle S} K^0_{\scriptscriptstyle S} K^{\pm }$ and $K^0_{\scriptscriptstyle S} K^0_{\scriptscriptstyle S} \pi ^{\pm }$. The results are based on a $711\mathrm {\,fb}^{-1}$ data sample that contains $772\times 10^6$ $B\overline{B}{}$ pairs, and was collected at the $\Upsilon {(4S)}$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. For $B^{\pm } \rightarrow K^0_{\scriptscriptstyle S} K^0_{\scriptscriptstyle S} K^{\pm }$ decays, the measured branching fraction and direct $C\!P$ asymmetry are $[10.42 \pm 0.43\mathrm {(stat)} \pm 0.22\mathrm {(syst)} ]\times 10^{-6}$ and [$+1.6\pm 3.9\mathrm {(stat)} \pm 0.9\mathrm {(syst)}$]%, respectively. In the absence of a statistically significant signal for $B^{\pm }\rightarrow K^0_{\scriptscriptstyle S} K^0_{\scriptscriptstyle S} \pi ^{\pm }$, we set the 90% confidence level upper limit on its branching fraction at $8.7 \times 10^{-7}$.