Measurement of the neutral $D$ meson mixing parameters in a time-dependent amplitude analysis of the $D^0\to\pi^+\pi^-\pi^0$ decay

TL;DR

This study measures the mixing parameters of neutral D mesons through a time-dependent amplitude analysis of the decay D0 to pi+ pi- pi0, using data from the BABAR detector to improve understanding of charm meson behavior.

Contribution

It provides the first measurement of D0-D0bar mixing parameters using a time-dependent amplitude analysis of the three-pion decay mode.

Findings

Measured mixing parameters: x = (1.5±1.2±0.6)% and y = (0.2±0.9±0.5)%

Results are consistent with no mixing within uncertainties

Uses a large data sample of 468.1 fb^{-1} from BABAR

Abstract

We measure the $D^0 - {\bar{D}}^0$ mixing parameters using a time-dependent amplitude analysis of the decay $D^0\to\pi^+\pi^-\pi^0$. The data were recorded with the BABAR detector at center-of-mass energies at and near the $\Upsilon(4S)$ resonance, and correspond to an integrated luminosity of approximately 468.1 ${\rm fb}^{-1}$. The neutral $D$ meson candidates are selected from $D^{*}(2010)^+\to D^0 \pi_s^+$ decays where the flavor at the production is identified by the charge of the low momentum pion, $\pi_s^+$. The measured mixing parameters are $x = (1.5\pm1.2\pm0.6) \%$ and $y = (0.2\pm0.9\pm0.5) \%$, where the quoted uncertainties are statistical and systematic, respectively.