Laboratoire d'Annecy-le-Vieux de Physique des Particules (LAPP), Université de Savoie, CNRS/IN2P3, F-74941 Annecy-Le-Vieux, France.
Phys Rev Lett. 2013 Sep 13;111(11):111801. doi: 10.1103/PhysRevLett.111.111801. Epub 2013 Sep 9.
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±1.7) keV, [corrected] 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±1.9) keV. [corrected] 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.
我们测量了 D*(2010)+与 D0 之间的质量差 Δm0 以及 D*(2010)+→D0π+跃迁的自然线宽 Γ。这些数据是在质心能量为 Υ(4S) 共振附近的 BABAR 探测器上记录的，对应于大约 477 fb-1 的积分亮度。D0 是通过 D0→K-π+和 D0→K-π+π-π+衰变模式重建的。对于 D0→K-π+衰变模式，我们得到 Γ=(83.4±1.7±1.5) keV 和 Δm0=(145425.6±0.6±1.7) keV，[已更正]其中给出的误差分别是统计误差和系统误差。对于 D0→K-π+π-π+模式，我们得到 Γ=(83.2±1.5±2.6) keV 和 Δm0=(145426.6±0.5±1.9) keV。[已更正]合并测量结果得到 Γ=(83.3±1.2±1.4) keV 和 Δm0=(145425.9±0.4±1.7) keV；宽度的精度比以前提高了约 12 倍，而质量差的精度提高了约 6 倍。
