We study charmless hadronic decays of charged $B$ mesons to the final states $K^{ 0}_{ S}K^{ 0}_{ S}K^{ \pm}$ and $K^{ 0}_{ S}K^{ 0}_{ S}\pi^{ \pm}$ using a $711 fb^{ -1}$ data sample that contains $772\times 10^6$ $B\bar{ B}$ pairs, and was collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{ +}e^{ -}$ collider. For $B^{ \pm}\to K^{ 0}_{ S}K^{ 0}_{ S}K^{ \pm}$, the measured branching fraction and direct $CP$ asymmetry are $[10.42\pm0.43(stat)\pm 0.22(syst)]\times10^{ -6}$ and [$+1.6\pm3.9(stat)\pm 0.9(syst)$]%, respectively. In the absence of a statistically significant signal for $B^{ \pm}\to K^{ 0}_{ S}K^{ 0}_{ S}\pi^{ \pm}$, we obtain a 90% confidence-level upper limit on its branching fraction as $8.7 \times10^{ -7}$.
Categories: hep-ex