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

Abstract

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 with the BABAR detector at center-of-mass energies at and near the ${\rm Y}(4S)$ resonance, and correspond to an integrated luminosity of approximately 468 ${\mathrm{fb}}^{-1}$. We measure $\Delta m_{+}=\left(140601.0\pm 6.8[\mathrm{stat}]\pm 12.9[\mathrm{syst}]\right)$ keV. We combine this result with a previous BABAR measurement of $\Delta m_0\equiv m(D^{\ast }(2010{)}^{+})-m(D^0)$ to obtain $\Delta m_D=m(D^{+})-m(D^0)=\left(4824.9\pm 6.8[\mathrm{stat}]\pm 12.9[\mathrm{syst}]\right)$ keV. These results are compatible with and approximately five times more precise than the Particle Data Group averages.

7 pages, 3 figures, submitted to Physical Review Letters

References in corpus (1)

• Strong and Electromagnetic Mass Splittings in Heavy Mesons