Measurement of Partial Widths and Search for Direct CP Violation in $D^0$ Meson Decays to $K^{-}{K}^{+}$ and ${\pi }^{-}{\pi }^{+}$

Abstract

We present a measurement of relative partial widths and decay rate CP asymmetries in $K^{-}{K}^{+}$ and ${\pi }^{-}{\pi }^{+}$ decays of $\Do$ mesons produced in $p\bar{p}$ collisions at $\sqrt{s} = 1.96 \TeV$. We use a sample of $2\times 10^5$ $D^{\ast+}\myto D^0π^+$ (and charge conjugate) decays with the $D^0$ decaying to $K^{-}{\pi }^{+}$, $K^{-}{K}^{+}$, and ${\pi }^{-}{\pi }^{+}$, corresponding to $123{\mathrm{pb}}^{-1}$ of data collected by the Collider Detector at Fermilab II experiment at the Fermilab Tevatron collider. No significant direct CP violation is observed. We measure $\KKtokpi = 0.0992 \pm 0.0011 \pm 0.0012$, $\PIpitokpi = 0.03594 \pm 0.00054 \pm 0.00040$, $A_{CP}(K^{-}{K}^{+})=(2.0\pm 1.2\pm 0.6)$, and $A_{CP}({\pi }^{-}{\pi }^{+})=(1.0\pm 1.3\pm 0.6)$, where, in all cases, the first uncertainty is statistical and the second is systematic.

7 pages, 3 figures

References in corpus (3)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Measurement of Prompt Charm Meson Production Cross Sections in p anti-p Collisions at s**(1/2) = 1.96 TeV
• $D^0-\overline{D^0}$ Mixing and Rare Charm Decays

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