CDF results on CP violation in charm

Abstract

I discuss the measurement of CP-violating asymmetries ($A_{\Gamma }$) between effective lifetimes of $D^0$ or ${\bar{D}}^0$ mesons. Fully reconstructed $D^0\to K^{+}{K}^{-}$ and $D^0\to {\pi }^{+}{\pi }^{-}$ decays collected in $p\bar{p}$ collisions by the Collider Detector at Fermilab experiment and corresponding to a data set of $9.7$~fb${}^{-1}$ of integrated luminosity are used. The flavor of the charm meson at production is determined by exploiting the decay $D^{\ast +}\to D^0{\pi }^{+}$. Contamination from mesons originated in $b$-hadron decays is subtracted from the sample. Signal yields as functions of the observed decay-time distributions are determined using likelihood fits and used to measure the asymmetries. The results, $A_{\Gamma }(K^{+}{K}^{-})=(-1.9\pm 1.5(stat)\pm 0.4(syst))\times 10^{-3}$ and $A_{\Gamma }({\pi }^{+}{\pi }^{-})=(-0.1\pm 1.8(stat)\pm 0.3(syst))\times 10^{-3}$, and their combination, $A_{\Gamma }=(-1.2\pm 1.2)\times 10^{-3}$, are consistent with the SM predictions and other experimental determinations.

9 pages, 3 figures, To be published in the proceedings of CHARM-2015, Detroit, MI, 18-22 May 2015

References in corpus (1)

• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016

Cited by in corpus (1)

• CP Asymmetries in Many-Body Final States in Beauty & Charm Transitions