A measurement of the rate of wrong-sign decays D0 -> K+ pi-

TL;DR

This paper reports a measurement of the wrong-sign decay rate of D0 mesons to K+ pi- relative to the favored decay, providing insights into D0-D0bar mixing phenomena using a large dataset from Belle.

Contribution

First measurement of the time integrated wrong-sign decay rate of D0 mesons relative to the favored decay using Belle data.

Findings

Measured R_WS = (0.372 +- 0.025 +0.009/-0.014)%

Provides data to derive D0-D0bar mixing parameters

Uses 46.2 fb^{-1} of data from Belle

Abstract

A D0 meson can decay to K+ pi- through doubly Cabibbo-suppressed decay or via D0-D0bar mixing. With 46.2 fb^{-1} of integrated luminosity collected by Belle, we have measured the time integrated rate of the wrong-sign process D0 -> K+ pi- relative to that of the Cabibbo-favored process D0 -> K- pi+ to be R_WS = (0.372 +- 0.025 +0.009/-0.014) % (preliminary). The D0-D0bar mixing parameters can be derived from the time distribution of the wrong-sign process.