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arXiv 1703.05613hep-phhep-ex
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用顶自旋极化信息约束新的共振物理

Constraining new resonant physics with top spin polarisation information

Christoph Englert, James Ferrando, Karl Nordström

摘要:

我们提供了一个全面的分析,包括顶夸克极化信息的动力学挑战$t\bar t$共振搜索,ATLAS和CMS开始失去灵敏度的权力。按照一般的建模和分析策略所追求的实验,我们分析的半轻子和双轻子$t\bar t$通道,并表明,包括偏振信息可以导致大的改进的限制设置程序与大的数据集。这将使我们能够在$m(t\bar t)$的灵敏度不够的情况下为参数选择设置限制。这突出了自旋观测的重要性,作为一个更全面的一组观测的一部分,以获得灵敏度BSM共振搜索。

英文摘要:

We provide a comprehensive analysis of the power of including top quark-polarisation information to kinematically challenging $t\bar t$ resonance searches, for which ATLAS and CMS start losing sensitivity. Following the general modeling and analysis strategies pursued by the experiments, we analyse the semi-leptonic and the di-lepton $t\bar t$ channels and show that including polarisation information can lead to large improvements in the limit setting procedures with large data sets. This will allow us to set limits for parameter choices where sensitivity from $m(t\bar t)$ is not sufficient. This highlights the importance of spin observables as part of a more comprehensive set of observables to gain sensitivity to BSM resonance searches.

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