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在8 TeV的质子-质子碰撞中轻子+喷注末态下[公式:见原文]产生截面的测量以及8 TeV与7 TeV截面的比值。

Measurements of the [Formula: see text] production cross section in lepton+jets final states in pp collisions at 8 [Formula: see text] and ratio of 8 to 7 [Formula: see text] cross sections.

作者信息

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机构信息

Yerevan Physics Institute, Yerevan, Armenia.

Institut für Hochenergiephysik der OeAW, Vienna, Austria.

出版信息

Eur Phys J C Part Fields. 2017;77(1):15. doi: 10.1140/epjc/s10052-016-4504-z. Epub 2017 Jan 7.

DOI:10.1140/epjc/s10052-016-4504-z
PMID:28260978
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5312161/
Abstract

A measurement of the top quark pair production ([Formula: see text]) cross section in proton-proton collisions at the centre-of-mass energy of 8[Formula: see text] is presented using data collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.6[Formula: see text]. This analysis is performed in the [Formula: see text] decay channels with one isolated, high transverse momentum electron or muon and at least four jets, at least one of which is required to be identified as originating from hadronization of a b quark. The calibration of the jet energy scale and the efficiency of b jet identification are determined from data. The measured [Formula: see text] cross section is [Formula: see text]. This measurement is compared with an analysis of 7[Formula: see text] data, corresponding to an integrated luminosity of 5.0[Formula: see text], to determine the ratio of 8[Formula: see text] to 7[Formula: see text] cross sections, which is found to be [Formula: see text]. The measurements are in agreement with QCD predictions up to next-to-next-to-leading order.

摘要

使用大型强子对撞机(LHC)上的CMS探测器收集的数据,给出了质心能量为8 TeV时质子 - 质子碰撞中顶夸克对产生([公式:见正文])截面的测量结果,对应积分亮度为19.6 fb⁻¹。该分析在[公式:见正文]衰变通道中进行,有一个孤立的、高横向动量的电子或μ子以及至少四个喷注,其中至少有一个喷注需要被识别为源自b夸克强子化。喷注能量刻度的校准和b喷注识别效率由数据确定。测量得到的[公式:见正文]截面为[公式:见正文]。将该测量结果与对应积分亮度为5.0 fb⁻¹的7 TeV数据的分析结果进行比较,以确定8 TeV与7 TeV截面的比值,发现该比值为[公式:见正文]。这些测量结果与 QCD 预测在次下一个领先阶之前均相符。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51e5/5312161/1c0f579b0312/10052_2016_4504_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51e5/5312161/50b7a779ffd7/10052_2016_4504_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51e5/5312161/e1af1e3697b7/10052_2016_4504_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51e5/5312161/1c0f579b0312/10052_2016_4504_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51e5/5312161/50b7a779ffd7/10052_2016_4504_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51e5/5312161/e1af1e3697b7/10052_2016_4504_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/51e5/5312161/1c0f579b0312/10052_2016_4504_Fig3_HTML.jpg

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Next-to-leading-order predictions for t-channel single-top production at hadron colliders.强子对撞机上t通道单顶夸克产生的次领头阶预测。
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