Study of charmless decays $B^{\pm }\to K_S^0{K}_S^0{h}^{\pm }$ ($h=K,\pi$) at Belle

We report a search for charmless hadronic decays of charged $B$ mesons to the final states $K_S^0{K}_S^0{K}^{\pm }$ and $K_S^0{K}_S^0{\pi }^{\pm }$ . The results are based on a $711{fb}^{-1}$ data sample that contains $772 \times 10^6$ $B\bar{B}$ pairs, and was collected at the $\mathrm{{\rm Y}}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. For $B^{\pm }\to K_S^0{K}_S^0{K}^{\pm }$ decays, the measured branching fraction and direct $CP$ asymmetry are $[10.64\pm0.49(stat)\pm 0.44(syst)]\times10^{-6}$and[$-0.6\pm3.9(stat)\pm 3.4(syst)$] %, respectively. In the absence of a statistically significant signal for $B^{\pm }\to K_S^0{K}_S^0{\pi }^{\pm }$, we set the 90 % confidence-level upper limit on its branching fraction at $1.14\times {10}^{-6}$.