Measurement of D0-D0bar mixing from a time-dependent amplitude analysis of D0 -> K+ pi- pi0 decays

TL;DR

This paper provides evidence of D0-D0bar mixing through a time-dependent amplitude analysis of D0->K+pi- pi0 decays, with a significance of 3.2 standard deviations, using data from the BaBar experiment.

Contribution

First measurement of D0-D0bar mixing parameters in D0->K+pi- pi0 decays using a time-dependent amplitude analysis.

Findings

Evidence of D0-D0bar mixing with 3.2 sigma significance.

Measured mixing parameters x' and y' with statistical and systematic uncertainties.

No evidence of CP violation in D0-D0bar mixing.

Abstract

We present evidence of $D^0$-$\bar{D^0}$ mixing using a time-dependent amplitude analysis of the decay D0->K+pi-pi0 in a data sample of 384 fb^-1 collected with the BaBar detector at the PEP-II e+e- collider at SLAC. Assuming CP conservation, we measure the mixing parameters x'_{Kpipi0} = [2.61^{+0.57}_{-0.68} (stat.) +- 0.39 (syst.)]%, y'_{Kpipi0} = [-0.06 ^{+0.55}_{-0.64} (stat.) +- 0.34 (syst.)]%. The confidence level for the data to be consistent with the no-mixing hypothesis is 0.1%, including systematic uncertainties. This result is inconsistent with the no-mixing hypothesis with a significance of 3.2 standard deviations. We find no evidence of CP violation in mixing.