Measurement of the inclusive cross-sections of single top-quark and top-antiquark t-channel production in pp collisions at √s=13 TeV with the ATLAS detector
Measurement of the inclusive cross-sections of single top-quark and top-antiquark t-channel production in pp collisions at √s=13 TeV with the ATLAS detector
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DOI：
10.1007/jhep04(2017)086
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发表时间：
2017-04-14
影响因子：
5.4
通讯作者：
Zwalinski, L.
中科院分区：
文献类型：
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作者：
Aaboud, M.;Aad, G.;Zwalinski, L.
使用质量中心能量为13 TeV的3.2 fb（-1）质子-质子碰撞数据，测量了轻子+喷流通道中的t通道单顶夸克和单顶反夸克产生横截面。2015年大型强子对撞机ATLAS探测器记录。事件的选择需要一个带电轻子（电子或μ子），缺少横向动量，和两个高横向动量的喷流，其中正好一个需要被b标记。使用对神经网络的判别分布的分箱最大似然拟合，确定横截面为sigma（tq）= 156 +/-5（stat.）+/-27（系统）+/-3（流明）pb，σ（t）/barq = 91 +/-4（stat.）+/-18（系统）+/-2（流明）pb的单顶反夸克生产，假设顶夸克质量为172.5 GeV。横截面比测量为R-t = sigma（tq）/sigma（（t）/barq）= 1.72 +/-0.09（stat.）+/-0.18（系统）。所有结果都与标准模型的预测一致。
A measurement of the t-channel single-top-quark and single-top-antiquark production cross-sections in the lepton+jets channel is presented, using 3.2 fb(-1) of proton-proton collision data at a centre-of-mass energy of 13 TeV, recorded with the ATLAS detector at the LHC in 2015. Events are selected by requiring one charged lepton (electron or muon), missing transverse momentum, and two jets with high transverse momentum, exactly one of which is required to be b-tagged. Using a binned maximum-likelihood fit to the discriminant distribution of a neural network, the cross-sections are determined to be sigma(tq) = 156 +/- 5 (stat.) +/- 27 (syst.) +/- 3 (lumi.) pb for single top-quark production and sigma((t) over barq) = 91 +/- 4 (stat.) +/- 18 (syst.) +/- 2 (lumi.) pb for single top-antiquark production, assuming a top-quark mass of 172.5 GeV. The cross-section ratio is measured to be R-t = sigma(tq) / sigma((t) over barq) = 1.72 +/- 0.09 (stat.) +/- 0.18 (syst.). All results are in agreement with Standard Model predictions.