Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of indirect CP-violating asymmetries in $D^0\to K^+K^-$ and
  $D^0\to \pi^+\pi^-$ decays at CDF   We report a measurement of the indirect CP-violating asymmetries
($A_{\Gamma}$) between effective lifetimes of anticharm and charm mesons
reconstructed in $D^0\to K^+ K^-$ and $D^0\to \pi^+\pi^-$ decays. We use the
full data set of proton-antiproton collisions collected by the Collider
Detector at Fermilab experiment and corresponding to $9.7$~fb$^{-1}$ of
integrated luminosity. The strong-interaction decay $D^{*+}\to D^0\pi^+$ is
used to identify the meson at production as $D^0$ or $\overline{D}^0$. We
statistically subtract $D^0$ and $\overline{D}^0$ mesons originating from
$b$-hadron decays and measure the yield asymmetry between anticharm and charm
decays as a function of decay time. We measure $A_\Gamma (K^+K^-) = (-0.19 \pm
0.15 (stat) \pm 0.04 (syst))\%$ and $A_\Gamma (\pi^+\pi^-)= (-0.01 \pm 0.18
(stat) \pm 0.03 (syst))\%$. The results are consistent with the hypothesis of
CP symmetry and their combination yields $A_\Gamma = (-0.12 \pm 0.12)\%$.

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The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: cs
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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc