标题： 在sqrt(s) = 189 GeV下寻找顶夸克和底夸克的超对称伙伴 显示英文标题

标题： Search for supersymmetric partners of top and bottom quarks at sqrt(s) = 189 GeV

摘要： 对顶夸克和底夸克的超对称伙伴的搜索结果使用了LEP在1997年和1998年采集的数据。 这些数据集中没有观察到与标准模型预期不符的情况，这些数据是在质心系能量为183 GeV和189 GeV下采集的，对应的积分亮度分别为54 pb^{-1} 和158 pb^{-1}。 这些结果与DELPHI在较低质心系能量下获得的结果结合使用，以在95%置信度下排除奇异子-中性子质量平面上的区域。 显示英文摘要

摘要： Searches for supersymmetric partners of top and bottom quarks are presented using data taken by the DELPHI experiment at LEP in 1997 and 1998. No deviations from standard model expectations are observed in these data sets, which are taken at centre-of-mass energies of 183 GeV and 189 GeV and correspond to integrated luminosities of 54 pb^{-1} and 158 pb^{-1}. These results are used in combination with those obtained by DELPHI at lower centre-of-mass energies to exclude regions in the squark-neutralino mass plane at 95% confidence level.