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Measurement of the d^{*}(2010)^{+} meson width and the d^{*}(2010)^{+}-d^{0} mass difference.

著者 Lees JP , Poireau V , Tisserand V , Grauges E , Palano A , Eigen G , Stugu B , Brown DN , Kerth LT , Kolomensky YG , Lee MJ , Lynch G , Koch H , Schroeder T , Hearty C , Mattison TS , McKenna JA , So RY , Khan A , Blinov VE , Buzykaev AR , Druzhinin VP ,
Phys Rev Lett.2013 Sep 13 ; 111(11):111801.
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Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France.

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We measure the mass difference Δm_{0} between the D^{*}(2010)^{+} and the D^{0} and the natural linewidth Γ of the transition D^{*}(2010)^{+}→D^{0}π^{+}. 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 D^{0} is reconstructed in the decay modes D^{0}→K^{-}π^{+} and D^{0}→K^{-}π^{+}π^{-}π^{+}. For the decay mode D^{0}→K^{-}π^{+} we obtain Γ=(83.4±1.7±1.5)  keV and Δm_{0}=(145425.6±0.6±1.8)  keV, where the quoted errors are statistical and systematic, respectively. For the D^{0}→K^{-}π^{+}π^{-}π^{+} mode we obtain Γ=(83.2±1.5±2.6)  keV and Δm_{0}=(145426.6±0.5±2.0)  keV. The combined measurements yield Γ=(83.3±1.2±1.4)  keV and Δm_{0}=(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.
PMID: 24074072 [PubMed - in process]
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