Measurement of the mass of the D0 meson

Le résumé fourni par la source

We report a measurement of the ${D}^{0}$ meson mass using the decay chain ${D}^{*}(2010{)}^{+}\ensuremath{\rightarrow}{D}^{0}{\ensuremath{\pi}}^{+}$ with ${D}^{0}\ensuremath{\rightarrow}{K}^{\ensuremath{-}}{K}^{\ensuremath{-}}{K}^{+}{\ensuremath{\pi}}^{+}$. The data were recorded with the BABAR detector at center-of-mass energies at and near the $\mathit{\ensuremath{\Upsilon}}(4S)$ resonance, and correspond to an integrated luminosity of approximately $477\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. We obtain $m({D}^{0})=(1864.841\ifmmode\pm\else\textpm\fi{}0.048\ifmmode\pm\else\textpm\fi{}0.063)\text{ }\text{ }\mathrm{MeV}$, where the quoted errors are statistical and systematic, respectively. The uncertainty of this measurement is half that of the best previous measurement.

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