Search for CP Violation in the Decays ${D^{\pm} \to K^0_{\scriptscriptstyle S} K^\pm$, ${D_s^{\pm} \to K^0_{\scriptscriptstyle S} K^\pm$, and ${D_s^{\pm} \to K^0_{\scriptscriptstyle S} \pi^\pm$

TL;DR

This study searches for CP violation in specific D meson decays using BaBar data, finding results consistent with no CP violation and providing the most precise measurements to date.

Contribution

First measurement of CP asymmetries in these D meson decay modes with unprecedented precision, using a large BaBar dataset.

Findings

All measured asymmetries are consistent with zero within uncertainties.

Results are the most precise to date for these decay channels.

No evidence of CP violation was observed in the studied decays.

Abstract

We report on a search for CP violation in the decays K^0_{\scriptscriptstyle S} K^\pm$, ${D_s^{\pm} \to K^0_{\scriptscriptstyle S} K^\pm$, and ${D_s^{\pm} \to K^0_{\scriptscriptstyle S} \pi^\pm$ using a data set corresponding to an integrated luminosity of $469\,\invfb$ collected with the BaBar detector at the PEP-II asymmetric energy \epem storage rings. The CP-violating decay rate asymmetries $A_{CP}$ are determined to be $(+0.13 \pm 0.36 \stat \pm 0.25 \syst)%$, $(-0.05 \pm 0.23 \stat \pm 0.24 \syst)%$, and $(+0.6 \pm 2.0 \stat \pm 0.3 \syst)%$, respectively for the three modes, before correction for the relevant K^0_{\scriptscriptstyle S} asymmetry. After this correction, all the measurements are consistent with zero within one standard deviation. These are currently the most precise measurements of these asymmetries.