Precision measurement of the D0 mass

We report a high precision measurement of the $D^0$ mass using $D^{*+} \rightarrow D^0 \pi^+, D^0 \rightarrow K^- K^- K^+ \pi^+$ decays in data collected by the B{\small{A}}B{\small{AR}} detector; the low Q-value of this decay gives us a strong control over the background and good resolution, in addition to minimizing systematic uncertainties. With a statistical uncertainty on the order of 50 keV and a total systematic uncertainty of approximately the same magnitude, which is dominated by the charged kaon mass uncertainty, our measurement will be more precise than the current world average, $1864.86 \pm 0.13$ MeV.