标题： CDF II探测器对底重子共振态Λ_b*的证据 显示英文标题

标题： Evidence for the bottom baryon resonance state Lambda_b* with the CDF II detector

摘要： 使用在费米实验室Tevatron对撞机上由CDF II探测器记录的质子-反质子碰撞数据，能量为Ecms=1.96 TeV，我们展示了Lambda_b*激发共振态在完全重建的衰变模式中的证据，该模式为Lambda_b0 pi+ pi-，其中Lambda_b0 -->Lambda_c+ (-->质子 K- pi+) pi-。 分析基于一个数据样本，其对应的积分亮度为9.6/fb，该样本通过在线事件选择获得，该选择基于远离质子-反质子相互作用点的轨迹。 观察到的信号的局部显著性为4.6个高斯标准差。 而搜索区域中信号的显著性为3.5个高斯标准差。 观测到的状态的质量被确定为5919.5+-0.35+-1.72 MeV。 显示英文摘要

摘要： Using data from proton-antiproton collisions at Ecms=1.96 TeV recorded by the CDF II detector at the Fermilab Tevatron, we present evidence for the excited resonance state Lambda_b* in its fully reconstructed decay mode to Lambda_b0 pi+ pi- where Lambda_b0 -->Lambda_c+ (-->proton K- pi+) pi-. The analysis is based on a data sample corresponding to an integrated luminosity of 9.6/fb collected by an online event selection based on tracks displaced from the proton-antiproton interaction point. The local significance of the observed signal is 4.6 Gaussian sigmas. while the significance of the signal for the search region is 3.5 Gaussian sigmas. The mass of the observed state is found to be 5919.5+-0.35+-1.72 MeV .