D0 mixing at CLEO II

TL;DR

This paper reports a measurement of D0 to K+ pi- decay rate and sets a limit on D0-D0bar mixing using upgraded CLEO detector data, providing insights into charm meson mixing phenomena.

Contribution

First measurement of the D0 to K+ pi- decay rate with upgraded detector data, and a new limit on D0-D0bar mixing at 90% confidence level.

Findings

Measured the D0 to K+ pi- decay rate as (0.31 +/- 0.09 +/- 0.07)%

Set a limit on D0-D0bar mixing of less than 1.1% at 90% CL

Enhanced sensitivity due to silicon vertex detector upgrade.

Abstract

The CLEO collaboration reported the observation of the ``wrong sign'' decay D0 -> K+ pi- in 1993. Recent upgrades to the CLEO detector, including the installation of a silicon vertex detector, have increased the sensitivity of the detector to D0 -> K+ pi-. Using 5.6 fb-1 of data we report a preliminary measurement of the rate of the wrong sign decay D0 -> K+ pi-, to be BR(D0 -> K+ pi-)/BR(D0 -> K- pi+) = (0.31 +/- 0.09 +/- 0.07)%. Additionally, combining this measurement with D0 proper lifetime information we set a limit on D0 - D0bar mixing of BR(D0 -> D0bar -> K+ pi-)/BR(D0 -> K- pi+) < 1.1% @ 90% confidence limit.