标题： D0顶夸克结果及其对成功网格计算的依赖 显示英文标题

标题： D0 Top Quark Results and their Dependence on Successful Grid Computing

摘要： 已知最重的费米子粒子——顶夸克——于1995年在费米实验室对撞机的第一轮运行中被发现。 然而，除了其存在之外，还需要精确研究其性质，以验证或推翻标准模型的预测。 由于顶夸克具有极高的质量与极短的寿命，这些测量探测了理论中尚未探索的领域，并使我们更接近解决我们宇宙中基本粒子的一些开放性根本问题，例如为什么存在三个夸克和轻子家族，以及为什么它们的质量差异如此巨大。 为了进行这些测量，必须重建和筛选数亿次记录的质子-反质子碰撞，以提取产生的少数顶夸克。 需要生成并重建包含完整探测器响应的模拟背景事件和信号事件，以验证和理解结果。 自对撞机第二轮运行开始以来，D0合作组已借助网格计算来协助生成模拟事件。 最近已增加了网格上的数据处理，从而使得我们能够有效地将高质量重建方法的数据量增加三倍。 我们将展示D0从这些改进的数据中获得的近期顶夸克结果，并解释这些结果如何受益于网格上计算资源的可用性。 显示英文摘要

摘要： The heaviest known Fermion particle -- the top quark -- was discovered at Fermilab in the first run of the Tevatron in 1995. However, besides its mere existence one needs to study its properties precisely in order to verify or falsify the predictions of the Standard Model. With the top quark's extremely high mass and short lifetime such measurements probe yet unexplored regions of the theory and bring us closer to solving the open fundamental questions of our universe of elementary particles such as why three families of quarks and leptons exist and why their masses differ so dramatically. To perform these measurements hundreds of millions of recorded proton-antiproton collisions must be reconstructed and filtered to extract the few top quarks produced. Simulated background and signal events with full detector response need to be generated and reconstructed to validate and understand the results. Since the start of the second run of the Tevatron the D0 collaboration has brought Grid computing to its aid for the production of simulated events. Data processing on the Grid has recently been added and thereby enabled us to effectively triple the amount of data available with the highest quality reconstruction methods. We will present recent top quark results D0 obtained from these improved data and explain how they benefited from the availability of computing resources on the Grid.