Mixing in the D0 - D0bar system at BaBar
Abstract
We report a preliminary result for D0-D0bar mixing and the doubly Cabibbo suppressed decay rate RD based on an analysis of D0 -> K+ pi- decays from 57.1 inverse fb of data collected at or just below the Y(4S) resonance with the BaBar detector at the PEP-II collider. We set 95% confidence limits for the mixing parameters x'2 and y' and find that our result is compatible with no mixing and no CP violation. In the limit of no mixing we find the doubly Cabibbo suppressed decay rate RD = (0.357 +- 0.022 (stat.) +- 0.027 (syst.))% and the CP violating asymmetry AD = 0.095 +- 0.061 (stat.) +- 0.083 (syst.).
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