Measurement of CP-violating asymmetries in D0→π+π- and D0→K+K- decays at CDF
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We report on a measurement of CP-violating asymmetries (A CP) in the Cabibbo-suppressed D0→π +π - and D0→K +K - decays reconstructed in a data sample corresponding to 5.9fb -1 of integrated luminosity collected by the upgraded Collider Detector at Fermilab. We use the strong decay D *+→D0π + to identify the flavor of the charmed meson at production and exploit CP-conserving strong cc̄ pair production in pp̄ collisions. High-statistics samples of Cabibbo-favored D0→K -π + decays with and without a D *± tag are used to correct for instrumental effects and significantly reduce systematic uncertainties. We measure A CP(D0→π +π -)=(+0.22±0.24(stat) ±0.11(syst))% and A CP(D0→K +K -)=(-0.24±0.22(stat)±0.09(syst))%, in agreement with CP conservation. These are the most precise determinations from a single experiment to date. Under the assumption of negligible direct CP violation in D0→π +π - and D0→K +K - decays, the results provide an upper limit to the CP-violating asymmetry in D0 mixing, |ACPind(D0)|<0.13% at the 90% confidence level. © 2012 American Physical Society.
author list (cited authors)
Aaltonen, T., González, B., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., ... Zucchelli, S.