Determination of the wrong sign decay rate D0 -> K+pi- and the sensitivity to D0-D0bar mixing

TL;DR

This paper measures the rate of wrong sign D0 decays to K+pi- relative to favored decays, exploring the potential for D0-D0bar mixing detection with high precision.

Contribution

It provides a precise measurement of the wrong sign decay rate and assesses the sensitivity to D0-D0bar mixing, advancing understanding of charm meson behavior.

Findings

Wrong sign decay rate: 0.383% with uncertainties

Sensitivity to D0-D0bar mixing demonstrated

Implications for charm mixing studies

Abstract

The D0 meson can decay to the wrong sign K+pi- state either through a doubly Cabibbo suppressed decay or via mixing to the D0bar state followed by the Cabibbo favoured decay D0bar -> K+ pi-. We measure the rate of wrong sign decays relative to the Cabibbo favoured decay to (0.383 +- 0.044 +- 0.022)% and give our sensitivity to a mixing signal.