Measurement of the difference in CP-violating asymmetries in D0→K+K- and D0→π+π - decays at CDF

摘要

We report a measurement of the difference (ΔA CP) between time-integrated CP-violating asymmetries in D0→K +K - and D0→π +π - decays reconstructed in the full data set of proton-antiproton collisions collected by the Collider Detector at Fermilab, corresponding to 9.7fb -1 of integrated luminosity. The strong decay D *+→D0π + is used to identify the charm meson at production as D0 or D ̄0. We measure ΔA CP=[-0.62±0.21(stat)±0.10(syst)]%, which differs from zero by 2.7 Gaussian standard deviations. This result supports similar evidence for CP violation in charm-quark decays obtained in proton-proton collisions. © 2012 American Physical Society.