arXiv 1807.028102018-07hep-ex

13 TeV pp碰撞中顶夸克对产生的底事件研究

Study of the underlying event in top quark pair production in pp collisions at 13 TeV

CMS Collaboration

备注：: Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-17-015 (CMS Public Pages)
发表信息：: Eur. Phys. J. C 79 (2019) 123
DOI：: 10.1140/epjc/s10052-019-6620-z

摘要：

测量了顶夸克和反夸克对产生过程中带电粒子径迹的归一化微分截面，它是重数和运动学变量的函数。测量是在13 TeV质心能量的质子-质子碰撞中进行的，并且基于2016年LHC CMS实验收集的数据，对应于35.9 fb $^{-1}$的积分亮度。事件包含一个电子，一个μ子，和两个喷流从强子化和分裂的b夸克。这些测量的特点，第一次，在顶夸克对生产的基础事件的属性，并显示没有偏离普适性假设的能量尺度通常高于顶夸克质量的两倍。

英文摘要：

Measurements of normalized differential cross sections as functions of the multiplicity and kinematic variables of charged-particle tracks from the underlying event in top quark and antiquark pair production are presented. The measurements are performed in proton-proton collisions at a center-of-mass energy of 13 TeV, and are based on data collected by the CMS experiment at the LHC in 2016 corresponding to an integrated luminosity of 35.9 fb$^{-1}$. Events containing one electron, one muon, and two jets from the hadronization and fragmentation of b quarks are used. These measurements characterize, for the first time, properties of the underlying event in top quark pair production and show no deviation from the universality hypothesis at energy scales typically above twice the top quark mass.

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