Search for CP violation in $D^0\to h^{+}{h}^{-}$ decays at CDF

Abstract

I report on a measurement of \CP-violating asymmetries ($A_{\Gamma }$) between effective lifetimes of $D^0$ or ${\bar{D}}^0$ in 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. The full CDF data set corresponding to $9.7$ fb${}^{-1}$ of integrated luminosity is used. The flavor of the charm meson at production is determined by exploiting the strong-interaction decay $D^{\ast +}\to D^0{\pi }^{+}$, while the contamination from mesons originated in $b$-hadron decays is evaluated and subtracted from the sample. Signal yields as functions of the observed decay-time distributions are extracted from maximum likelihood fits and used to measure the asymmetries. The results, $A_{\Gamma }(K^{+}{K}^{-})=(-1.9\pm 1.5(\mathrm{stat})\pm 0.4(\mathrm{syst}))\times 10^{-3}$ and $A_{\Gamma }({\pi }^{+}{\pi }^{-})=(-0.1\pm 1.8(\mathrm{stat})\pm 0.3(\mathrm{syst}))\times 10^{-3}$, and their combination, $A_{\Gamma }=(-1.2\pm 1.2)\times 10^{-3}$, are consistent with the SM predictions and other experimental determinations.

5 pages, 4 figures, CKM2014 conference proceedings

References in corpus (1)

• Measurement of indirect CP-violating asymmetries in $D^0\to K^{+}{K}^{-}$ and $D^0\to {\pi }^{+}{\pi }^{-}$ decays at CDF