22-28 July 2010
Palais des Congrès de Paris
Europe/Paris timezone

Precision measurements of Direct CP violation and D0-D0bar mixing at CDF

23 Jul 2010, 16:45
Salle 242A ()

Salle 242A

Parallel Session Talk 06 - CP violation, CKM and Rare Decays 06 - CP violation, CKM and Rare Decays


Mark Edward Mattson (Dept of Physics and Astronomy-Wayne State U.)


The CDF experiment has previously reported evidence for D0-D0bar mixing with a significance equivalent to 3.8 standard deviations based on the time-dependent ratio of the decay rates for D0 --> K^+pi^- and D0 -->K^-pi^+, and charge-conjugates. That measurement was based on an integrated luminosity of 1.5 fb-1 and achieved sensitivities of +-0.35*10-3 and +-7.6*10-3 on the mixing parameters x'^2 and y', respectively. Here we report an updated measurement using the same technique. In addition, we present an analysis that measures CP-violating asymmetries in D*-tagged D0-->pi^+pi^- decays, where any enhancement from the standard model prediction (of the order of 10-3) would be unambiguous evidence for New Physics. A technique combining asymmetries of pi^+pi^-, and K^-pi^+ D0 decays highly suppresses systematic uncertainties due to detector charge-asymmetric efficiencies allowing a measurement limited only by statistical uncertainties. Both measurements are based on a sample corresponding to an integrated luminosity of 5.2 fb-1.

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