Top quark production and properties in 7 TeV proton-proton collisions

顶夸克是夸克区中最重、最不为人所知的粒子。顶夸克性质的精确测量对标准模型之外的新物理非常敏感。有了这个提议，我们计划从2007年开始利用大型强子对撞机上的ATLAS探测器提供的数据来研究顶夸克。特别是，我们将测量顶对和单顶生产截面，顶部衰变的W螺旋度和顶自旋相关性。由于每次测量的精度都将达到前所未有的水平，每个结果都将提供对粒子物理学标准模型的严格测试。顶夸克是通过标记其衰变产物之一底夸克（b-标记）来识别的。我们计划为这一广泛合作的努力作出重大贡献。该项目包括开发用于大型强子对撞机升级的像素探测器。最内层的探测器在识别b夸克方面起着重要作用。这将是对撞机物理的长期未来的重要贡献，并可能导致在其他领域的应用。特别是，传感器材料和模块链供电方案的新概念将被探索。

The top quark is the heaviest and least known particle in the quark sector. Precision measurements of top quark properties are sensitive to new physics beyond the Standard Model. With this proposal we plan to study the top quark with the data available starting in 2007 from the ATLAS detector at the LHC collider. In particular we will measure the top-pair and single-top production cross sections, the W helicity in top decays and top spin correlations. As the precision of each measurement will reach levels never attained before, each result will provide a stringent test of the Standard Model of particle physics. Top quarks are identified through the tagging of one of its decay products, the bottom quark (b-tagging). We plan to significantly contribute to this collaboration wide effort.This project includes the development of pixel detectors for the LHC upgrade. The innermost detector plays a major role in the identification of b-quarks. It will be an essential contribution for the long-term future of collider physics and might result in applications in other fields. In particular, new concepts for sensor materials and module chain powering schemes will be explored.