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arXiv 1702.07546hep-ex
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用ATLAS探测器测量$\sqrt{s}$ = 8 TeV的全强子$t\bar{t}$衰变道中顶夸克质量

Top-quark mass measurement in the all-hadronic $t\bar{t}$ decay channel at $\sqrt{s}$ = 8 TeV with the ATLAS detector

ATLAS Collaboration

摘要:

顶夸克质量是在全强子顶-反顶夸克衰变通道中使用质子-质子碰撞测量的,质心能量为$\sqrt{s}$ = 8 TeV,使用的是欧洲核子研究中心大型强子对撞机上的ATLAS探测器。分析中使用的数据集对应于20.2 fb $^{-1}$的积分亮度。大的多射流背景建模使用数据驱动的方法。顶夸克质量是通过模板拟合三喷流与双喷流质量之比获得的。三喷流质量是由顶夸克衰变的三个喷流得到的。从这三个喷流的dijet质量获得使用两个喷流分配到W玻色子衰变。顶夸克的质量被测量为173.72 $\pm$ 0.55(统计)。$\pm$ 1.01(系统)GeV。

英文摘要:

The top-quark mass is measured in the all-hadronic top-antitop quark decay channel using proton-proton collisions at a centre-of-mass energy of $\sqrt{s}$ = 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. The data set used in the analysis corresponds to an integrated luminosity of 20.2 fb$^{-1}$. The large multi-jet background is modelled using a data-driven method. The top-quark mass is obtained from template fits to the ratio of the three-jet to the dijet mass. The three-jet mass is obtained from the three jets assigned to the top quark decay. From these three jets the dijet mass is obtained using the two jets assigned to the W boson decay. The top-quark mass is measured to be 173.72 $\pm$ 0.55 (stat.) $\pm$ 1.01 (syst.) GeV.

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