Nisar Nellikunnummel

10 December 2021

Abstract: We report the result of $D^0$ and $D^+$ lifetime measurement using $\Dz$ and $\Dp $ decays reconstructed using $72~{\rm fb^{-1}}$ of data collected by the Belle II experiment at SuperKEKB asymmetric-energy $e^+e^−$ collider. The results, $\tau(D^0)=410.5\pm1.1({\rm stat})\pm0.8({\rm syst})~{\rm fs}$ and $\tau(D^+)=1030.4\pm4.7({\rm stat})\pm 3.1({\rm syst})~{\rm fs}$ are the most precise to date and are consistent with previous measurements.