Measurement of Mixing and CP Violation in the Two-Body D0 decays to KK, pipi and Kpi with the BaBar Experiment

We present a measurement of D0-D0bar mixing and CP violation using the ratio of lifetimes simultaneously extracted from a sample of D0 mesons produced through the flavor-tagged process D*+ -> D0 pi+, where D0 decays to D0->Kpi, KK, or pipi, along with the untagged decays D0 -> Kpi and D0 -> KK. The lifetimes of the CP-even, Cabibbo-suppressed modes KK and pipi are compared to that of the CP-mixed mode Kpi in order to measure yCP and DeltaY. We obtain yCP = [0.72 +/- 0.18 (stat) +/- 0.12 (syst)]% and DeltaY = [0.09 +/- 0.26 (stat) +/- 0.06 (syst)]%, where DeltaY constrains possible CP violation. The yCP result excludes the null mixing hypothesis at 3.3 sigma significance. This analysis is based on an integrated luminosity of 468 fb^{-1} collected with the Babar, detector at the PEP-II asymmetric-energy e+e- collider.