Mixing and \CP Violation in Charm Decays at BABAR

TL;DR

This paper reports precise measurements of charm meson mixing and CP violation using the full BABAR dataset, finding no evidence of CP violation but confirming mixing with high significance.

Contribution

First comprehensive analysis of mixing and CP violation in charm decays at BABAR, employing both model-dependent and independent methods across multiple decay channels.

Findings

No evidence of direct or indirect CP violation.

Measured y_CP with highest precision to date.

Excluded no-mixing hypothesis at 3.3 sigma.

Abstract

In this proceedings we present a measurement of mixing, and searches for direct and indirect CP asymmetries in the charm sector using the full \babar data sample of $469 \invfb$. Searches for direct CP asymmetries have been performed in the $D^{\pm} \to K^0_{\scriptscriptstyle S} K^\pm$, $D_s^{\pm} \to K^0_{\scriptscriptstyle S} K^\pm$, $D_s^{\pm}\to K^0_{\scriptscriptstyle S} \pi^\pm$, and $D^{\pm} \to K^+ K^- \pi^\pm$ decay channels, with both model-dependent and model-independent approaches being exploited for the last mode. The mixing measurement and the search for indirect CP asymmetry have been performed with the $D^0 \to K^+ K^-$, $D^0 \to \pi^+ \pi^-$, and $D^0 \to K^\pm \pi^\mp$ decay modes (the use of charge-conjugate modes is implied). We have found no evidence of direct or indirect CP violation in any of the measured channels, and those are the most precise determinations to date. We have measured $y_{CP}$ with the highest precision to date, and have excluded the no-mixing hypothesis at $3.3\sigma$ significance.