Neutral Charm Decays at CLEO: Searches for CP Violation and Mixing

TL;DR

This paper reports on CLEO's search for CP violation and mixing in neutral charm meson decays, finding no CP asymmetry, measuring the mixing parameter y_CP, and determining the wrong-sign decay rate, contributing to understanding charm meson behavior.

Contribution

It presents the first measurement of the wrong-sign D0 to K+ pi- pi0 decay rate and provides new limits on CP violation and mixing parameters in charm decays.

Findings

No evidence of CP asymmetry in five decay modes.

Measured mixing parameter y_CP = -0.011 +- 0.025 +- 0.014.

First measurement of wrong-sign decay rate R_WS = (0.43 +0.11 -0.10 +- 0.07)%.

Abstract

Recent CLEO results on neutral charm meson decays presented at the XXXVIth Rencontres de Moriond are discussed. We find no evidence of CP asymmetry in five different two-body decay modes of the D0 to pairs of light pseudo-scalar mesons. We present a measurement of the mixing parameter y_CP = -0.011 +- 0.025 +- 0.014 by searching for a lifetime difference between the CP neutral K+ pi- final state and the CP even K+ K- and pi+ pi- final states. Finally, we describe the first measurement of the rate of wrong-sign D0 to K+ pi- pi0 decay: R_WS = (0.43 +0.11 -0.10 +- 0.07)%.