1207.2158 (CDF Collaboration)

Measurement of the difference of CP--violating asymmetries in D^0 ->
K^+K^- and D^0 ->π^+π^- decays at CDF    [PDF]

CDF Collaboration

We report a measurement of the difference (Delta\Acp) between time-integrated CP--violating asymmetries in D^0-> K^+ K^- and D^0-> \pi^+\pi^- decays reconstructed in the full data set collected by the Collider Detector at Fermilab, corresponding to 9.7 fb^{-1} of integrated luminosity. The strong decay D^{*+}->D^0 pi^+ is used to identify the charm meson at production as D^0 or \bar{D}^0. We measure Delta\Acp = [-0.62 +- 0.21 (stat) +- 0.10 (syst)] %, which differs from zero by 2.7 Gaussian standard deviations.This result strongly supports similar evidence for CP violation in charm-quark decays obtained in pp collisions.

View original: http://arxiv.org/abs/1207.2158