Branching Fractions and CP Asymmetries in B[superscript 0]→K[superscript +]K[superscript -]K[subscript S][superscript 0] and B[superscript +]→K[superscript +]K[subscript S][superscript 0]K[subscript S][superscript 0]

Abstract

We measure the branching fractions and CP asymmetries in the decays B[superscript 0]→K[superscript +]K[superscript -]K[subscript S][superscript 0] and B[superscript +]→K[superscript +]K[subscript S][superscript 0]K[subscript S][superscript 0] using a sample of approximately 122×10[superscript 6] BB̅ pairs collected by the BABAR detector. From a time-dependent analysis of the K[superscript +]K[superscript -]K[subscript S][superscript 0] sample that excludes ϕK[subscript S][superscript 0], the values of the CP-violation parameters are S=-0.56±0.25±0.04 and C=-0.10±0.19±0.10, where the first uncertainty is statistical and the second is systematic. We confirm that the final state is nearly purely CP even and extract the standard model parameter sin⁡2β=0.57±0.26±0.04[subscript -0][superscript +0.17] where the last error is due to uncertainty on the CP content. We present the first measurement of the CP-violating charge asymmetry A[subscript CP](B[superscript +]→K[superscript +]K[subscript S][superscript 0]K[subscript S][superscript 0])=-0.04±0.11±0.02. The branching fractions are B(B[superscript 0]→K[superscript +]K[superscript -]K[superscript 0])=(23.8±2.0±1.6)×10[superscript -6] and B(B[superscript +]→K[superscript +]K[subscript S][superscript 0]K[subscript S][superscript 0])=(10.7±1.2±1.0)×10[superscript -6].