Search for CP Violation in the Decay D+/- -> Ks pi+/-

We report on a search for CP violation in the decay $D^\pm \to K^0_{\scriptscriptstyle S} π^\pm$ using a data set corresponding to an integrated luminosity of $469\,\,fb^{-1}$ collected with the \slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R} detector at the PEP-II asymmetric energy $e^+e^-$ storage rings. The CPviolating decay rate asymmetry $A_{CP}$ is determined to be $(-0.44 \pm 0.13 \mathrm{(stat)} \pm 0.10 \mathrm{(syst)})$, consistent with zero at 2.7 $σ$ and with the standard model prediction of $(-0.332 \pm 0.006)$. This is currently the most precise measurement of this parameter.

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