Measurements of branching fraction and direct CP asymmetry in B±→K0SK0SK± and a search for B±→K0SK0Sπ±

Abstract

We study charmless hadronic decays of charged B mesons to the final states K0SK0SK± and K0SK0Sπ± using a 711 fb−1 data sample that contains 772×106 B¯B pairs and was collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. For B±→K0SK0SK±, the measured branching fraction and direct CP asymmetry are [10.42±0.43(stat)±0.22(syst)]×10−6 and [+1.6±3.9(stat)±0.9(syst)]%, respectively. In the absence of a statistically significant signal for B±→K0SK0Sπ±, we obtain a 90% confidence-level upper limit on its branching fraction as 8.7×10−7.