Branching Fractions and CP Asymmetries in B0→K+K-KS0 and B+→K+KS0KS0

We measure the branching fractions and CP asymmetries in the decays B0→K+K-KS0 and B+→K+KS0KS0 using a sample of approximately 122×106 BB̅ pairs collected by the BABAR detector. From a time-dependent analysis of the K+K-KS0 sample that excludes ϕKS0, 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±0.04-0+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 ACP(B+→K+KS0KS0)=-0.04±0.11±0.02. The branching fractions are B(B0→K+K-K0)=(23.8±2.0±1.6)×10-6 and B(B+→K+KS0KS0)=(10.7±1.2±1.0)×10-6.