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 477fb-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.

Measurement of the D^{*}(2010)^{+} Meson Width and the D^{*}(2010)^{+}-D^{0} Mass Difference

LANCERI, LIVIO;VITALE, LORENZO;
2013

Abstract

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 477fb-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.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11368/2768947
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