Measurement of the $D^{\ast }(2010{)}^{+}-D^{+}$ mass difference

The BaBar Collaboration

We measure the mass difference, $\Delta m_{+}$, between the $D^{\ast }(2010{)}^{+}$ and the $D^{+}$ using the decay chain $D^{\ast }(2010{)}^{+}\to D^{+}{\pi }^0$ with $D^{+}\to K^{-}{\pi }^{+}{\pi }^{+}$. The data were recorded w…