First measurement of Γ(D* +) and precision measurement of m D*+-m D0
First measurement of Γ(D* +) and precision measurement of m D*+-m D0
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DOI：
10.1103/physrevd.65.032003
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发表时间：
2001-08
影响因子：
5
通讯作者：
A. Anastassov;E. al.
中科院分区：
文献类型：
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作者：
A. Anastassov;E. al.
我们使用 CLEO II.V 探测器在 Upsilon(4S) 共振附近收集的 e+ e- 数据的 9/fb 首次测量 D*+ 宽度。我们的方法使用先进的跟踪技术和重建方法，利用 CESR 束斑的小垂直尺寸来测量 D*+ -> D0 pi+ 衰变的能量释放分布。我们发现 Gamma(D*+) = 96 +- 4（统计）+- 22（系统）keV。我们还测量衰变中的能量释放并计算 Delta m = m(D*+) - m(D0) = 145.412 +- 0.002（统计）+- 0.012（系统）MeV/c^2
We present the first measurement of the D*+ width using 9/fb of e+ e- data collected near the Upsilon(4S) resonance by the CLEO II.V detector. Our method uses advanced tracking techniques and a reconstruction method that takes advantage of the small vertical size of the CESR beam spot to measure the energy release distribution from the D*+ -> D0 pi+ decay. We find Gamma(D*+) = 96 +- 4 (Statistical) +- 22 (Systematic) keV. We also measure the energy release in the decay and compute Delta m = m(D*+) - m(D0) = 145.412 +- 0.002 (Statistical) +- 0.012 (Systematic) MeV/c^2