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arXiv 0810.2074hep-ex
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D0上的顶级夸克物理结果

Results on Top Quark Physics at D0

Y. Peters

摘要:

1995年,在费米实验室的Tevatron对撞机上,CDF和D 0合作在sqrt(s)=1.8 TeV的ppbar碰撞中发现了顶夸克,每次实验使用的数据约为50 pb ^-1。我们利用D 0实验在质心能量为1.96 TeV时收集的1 fb ^-1数据对顶夸克的性质进行了研究。增加的统计数据和更高的碰撞能量允许对顶夸克的产生和衰变特性进行精确测量,并打开了在顶夸克扇区中探测超越标准模型的物理学的可能性。主要介绍了顶夸克衰变的顶夸克对产生截面和分支分数的测量,对ttbar共振的探索,以及顶夸克对产生截面比的测量及其新物理解释。

英文摘要:

In 1995, the top quark was discovered at the Fermilab Tevatron Collider by the CDF and D0 collaborations in the ppbar collisions at sqrt(s)=1.8 TeV using about 50pb^-1 of data per experiment. We present the studies of the top quark properties based on 1fb^-1 of data collected by the D0 experiment at a center of mass energy of 1.96TeV. The increased statistics and higher collision energy allow to perform precision measurements of the top quark production and decay characteristics and open the possibility to probe physics beyond the Standard Model in the top quark sector. The presentation mainly focuses on the measurement of the top pair production cross section and branching fraction of the top quark decays, a search for ttbar resonances, and the measurement of the top quark pair production cross section ratio and its interpretation in terms of new physics.

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