Measurement of the masses and widths of the bottom baryons Sigma_b+- and Sigma_b*+-
Measurement of the masses and widths of the bottom baryons Sigma_b+- and Sigma_b*+-
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测量底部重子 Sigma_b - 和 Sigma_b* - 的质量和宽度
DOI：
10.1103/physrevd.85.092011
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发表时间：
2011
影响因子：
5
通讯作者：
E. al.
中科院分区：
文献类型：
--
作者：
C. C. T. Aaltonen;E. al.
利用费米实验室 Tevatron 的 CDF II 探测器记录的能量 Ecm = 1.96 TeV 的质子-反质子碰撞数据，我们提出了改进的质量测量以及四个底部重子共振态 Sigma_b+、Sigma_b*+ 和 Sigma_b-、Sigma_b*- 自然宽度的首次测量。这些状态在其衰变模式中完全重构为 Lambda_b pi+-，其中 Lambda_b -->Lambda_c+ pi- 和 Lambda_c+ -->prot K- pi+。该分析基于对应于 6.0/fb 积分光度的数据样本，该数据样本是通过基于质子-反质子相互作用点位移的轨迹的在线事件选择收集的。
Using data from proton - anti-proton collisions at the energy Ecm = 1.96 TeV recorded by the CDF II detector at the Fermilab Tevatron, we present improved measurements of the masses and first measurements of natural widths of the four bottom baryon resonance states Sigma_b+, Sigma_b*+ and Sigma_b-, Sigma_b*-. These states are fully reconstructed in their decay modes to Lambda_b pi+-, where Lambda_b -->Lambda_c+ pi- with Lambda_c+ -->prot K- pi+. The analysis is based on a data sample corresponding to an integrated luminosity of 6.0/fb collected by an online event selection based on tracks displaced from the proton - anti-proton interaction point.