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arXiv 1607.00837hep-ex
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在sqrt(s)= 7和8 TeV的pp碰撞中顶夸克对产生微分截面随运动学事件变量的变化

Measurement of the differential cross sections for top quark pair production as a function of kinematic event variables in pp collisions at sqrt(s) = 7 and 8 TeV

CMS Collaboration

摘要:

测量了顶夸克对产生的归一化微分截面,涉及四个运动学事件变量:丢失的横向能量;喷流横向动量的标量和(pT);事件中所有物体的pT的标量和;以及来自顶夸克衰变的轻子衰变W玻色子的pT。数据样本,收集使用CMS探测器在大型强子对撞机,包括5.0反femtobarns的质子-质子碰撞在sqrt(s)= 7 TeV和19.7反femtobarns在sqrt(s)= 8 TeV。选择包含一个电子或μ子的顶夸克对事件。校正后的检测器的影响,允许直接与理论预测的结果。没有观察到与几个标准模型事件模拟发生器的预测的显著偏差。

英文摘要:

Measurements are reported of the normalized differential cross sections for top quark pair production with respect to four kinematic event variables: the missing transverse energy; the scalar sum of the jet transverse momentum (pT); the scalar sum of the pT of all objects in the event; and the pT of leptonically decaying W bosons from top quark decays. The data sample, collected using the CMS detector at the LHC, consists of 5.0 inverse femtobarns of proton-proton collisions at sqrt(s) = 7 TeV and 19.7 inverse femtobarns at sqrt(s) = 8 TeV. Top quark pair events containing one electron or muon are selected. The results are presented after correcting for detector effects to allow direct comparison with theoretical predictions. No significant deviations from the predictions of several standard model event simulation generators are observed.

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