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arXiv 1805.01428hep-ex
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用$\sqrt{s} =$ ~(13)TeV pp碰撞测量轻子+喷注末态顶夸克质量

Measurement of the top quark mass with lepton+jets final states using pp collisions at $\sqrt{s} =$ 13 TeV

CMS Collaboration

摘要:

顶夸克的质量是使用CMS探测器收集的$\mathrm{t\overline{t}}$事件样本测量的,CMS探测器使用$\sqrt{s} =$ 13 TeV的质子-质子碰撞。事件被选择与一个孤立的μ介子或电子和至少四个喷流从对应于35.9 fb $^{-1}$的积分亮度的数据。对于每个事件的质量是重建从一个运动学拟合的衰变产物的$\mathrm{t\overline{t}}$假设。使用表意方法,顶夸克质量的同时确定的总喷流能量标度因子(JSF),约束的质量的W玻色子在$\mathrm{q\overline{q}'}$衰变。测量校准样品模拟在下一个领先的顺序匹配到领先的部分子簇射。顶夸克质量为172.25 $\pm$ 0.08(stat+JSF)$\pm$ 0.62(syst)GeV。该结果的运动学性质的事件的依赖性进行了研究,并比较预测的不同模型的$\mathrm{t\overline{t}}$生产,并没有迹象表明在测量中的偏差进行观察。

英文摘要:

The mass of the top quark is measured using a sample of $\mathrm{t\overline{t}}$ events collected by the CMS detector using proton-proton collisions at $\sqrt{s} =$ 13 TeV at the CERN LHC. Events are selected with one isolated muon or electron and at least four jets from data corresponding to an integrated luminosity of 35.9 fb$^{-1}$. For each event the mass is reconstructed from a kinematic fit of the decay products to a $\mathrm{t\overline{t}}$ hypothesis. Using the ideogram method, the top quark mass is determined simultaneously with an overall jet energy scale factor (JSF), constrained by the mass of the W boson in $\mathrm{q\overline{q}'}$ decays. The measurement is calibrated on samples simulated at next-to-leading order matched to a leading-order parton shower. The top quark mass is found to be 172.25 $\pm$ 0.08 (stat+JSF) $\pm$ 0.62 (syst) GeV. The dependence of this result on the kinematic properties of the event is studied and compared to predictions of different models of $\mathrm{t\overline{t}}$ production, and no indications of a bias in the measurements are observed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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