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

We measure the $D^0 - {\bar{D}}^0$ mixing parameters using a time-dependent amplitude analysis of the decay $D^0\toπ^+π^-π^0$. The data were recorded with the BABAR detector at center-of-mass energies at and near the $Υ(4S)$ resonance, and correspond to an integrated luminosity of approximately 468.1 ${\rm fb}^{-1}$. The neutral $D$ meson candidates are selected from $D^{*}(2010)^+\to D^0 π_s^+$ decays where the flavor at the production is identified by the charge of the low momentum pion, $π_s^+$. 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.