We report a measurement of the indirect CP-violating asymmetries
($A_{Gamma}$) between effective lifetimes of anticharm and charm mesons
reconstructed in $D^0 o K^+ K^-$ and $D^0 o pi^+pi^-$ 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 decay $D^{*+} o D^0pi^+$ 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 $A_Gamma = (-0.12 pm 0.12)\%$.
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
REGISTER
Did you like this article? 
