首页> 外文期刊>Physics Letters, B. Nuclear Physics and High Energy Physics >Measurement of the t(t)over-barb(b)over-bar production cross section in the all-jet final state in pp collisions at root s=13 TeV
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Measurement of the t(t)over-barb(b)over-bar production cross section in the all-jet final state in pp collisions at root s=13 TeV

机译:在根S = 13 TEV的PP碰撞中的全喷射最终状态下的T(t)过律额的T(b)过律额的横截面测量

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摘要

A measurement of the production cross section of top quark pairs in association with two b jets (t (t) over barb (b) over bar) is presented using data collected in proton-proton collisions at root s=13 TeV by the CMS detector at the LHC corresponding to an integrated luminosity of 35.9 fb(-1). The cross section is measured in the all-jet decay channel of the top quark pair by selecting events containing at least eight jets, of which at least two are identified as originating from the hadronization of b quarks. A combination of multivariate analysis techniques is used to reduce the large background from multijet events not containing a top quark pair, and to help discriminate between jets originating from top quark decays and other additional jets. The cross section is determined for the total phase space to be 5.5 +/- 0.3 (stat)(-1.3)(+)(1.6) (syst)pb and also measured for two fiducial t (t) over barb (b) over bar, definitions. The measured cross sections are found to be larger than theoretical predictions by a factor of 1.5-2.4, corresponding to 1-2 standard deviations. (C) 2020 The Author. Published by Elsevier B.V.
机译:使用CMS检测器在根S = 13 Tev的质子 - 质子碰撞中收集的数据来提出与两个B喷气机(T(b)上的BARB(B)上的T(B)上的TOP BET(B)上的TOPB(B)的生产横截面的测量在对应于35.9 fb(-1)的集成光度的LHC。通过选择包含至少八个喷射器的事件在顶部Quark对的全曲线衰减通道中测量横截面,其中至少两个被识别为源自B夸克的不全。多变量分析技术的组合用于减少不包含顶部Quark对的多jet事件的大背景,并帮助区分源自顶部夸克衰减和其他额外喷射的喷射器。确定总相空间的横截面为5.5 +/- 0.3(统计)( - 1.3)(+)(+)(1.6)(SYST)PB,并且还在倒钩(B)上的两个基准T(T)测量酒吧,定义。发现测量的横截面大于理论上的预测,比对应于1-2个标准偏差的因子为1.5-2.4。 (c)2020作者。由elsevier b.v出版。

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