Measurement of the D^{*}(2010)^{+} natural linewidth and the D^{*}(2010)^{+}-D^{0} mass difference

We measure the mass difference, Δm0, between the D∗(2010)+ and the D0 and the natural linewidth, Γ, of the transition D∗(2010)+→D0π+. The data were recorded with the BABAR detector at center-of-mass energies at and near the Υ(4S) resonance, and correspond to an integrated luminosity of approximately 477  fb−1. The D0 is reconstructed in the decay modes D0→K−π+ and D0→K−π+π−π+. For the decay mode D0→K−π+ we obtain Γ=(83.4±1.7±1.5)  keV and Δm0=(145425.6±0.6±1.8)  keV, where the quoted errors are statistical and systematic, respectively. For the D0→K−π+π−π+ mode we obtain Γ=(83.2±1.5±2.6)  keV and Δm0=(145426.6±0.5±2.0)  keV. The combined measurements yield Γ=(83.3±1.2±1.4)  keV and Δm0=(145425.9±0.4±1.7)  keV; the width is a factor of approximately 12 times more precise than the previous value, while the mass difference is a factor of approximately 6 times more precise.