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    • Measurement of the inclusive t(t)over-bar production cross section in proton-proton collisions at s=5.02 TeV

    Journal of High Energy Physics（2022）SCI 2区SCI 1区

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    Abstract
    The top quark pair production cross section is measured in proton-proton collisions at a center-of-mass energy of 5.02 TeV. The data were collected in a special LHC low-energy and low-intensity run in 2017, and correspond to an integrated luminosity of 302 pb(-1). The measurement is performed using events with one electron and one muon of opposite charge, and at least two jets. The measured cross section is 60.7 +/- 5.0 (stat) +/- 2.8 (syst) +/- 1.1 (lumi) pb. A combination with the result in the single lepton + jets channel, based on data collected in 2015 at the same center-of-mass energy and corresponding to an integrated luminosity of 27.4 pb(-1), is then performed. The resulting measured value is 63.0 +/- 4.1 (stat) +/- 3.0 (syst+lumi) pb, in agreement with the standard model prediction of 66.8(-3.1)(+2.9) pb.
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    Hadron-Hadron Scattering,Top Physics
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    【要点】：本文通过质子-质子对撞实验，测量了在中心质能5.02 TeV下的顶夸克对产生截面，并与标准模型预测进行了对比，验证了模型的准确性。
    

    【方法】：研究利用2017年LHC低能低强度运行中收集的数据，通过检测事件中一个电子和一个反电荷的μ子以及至少两个喷流，计算顶夸克对的产生截面。
    

    【实验】：实验在LHC上完成，使用的数据集对应于302 pb(-1)的积分亮度，通过结合2015年相同能量下收集的单一轻子+jets通道数据（27.4 pb(-1)积分亮度），得到顶夸克对产生的截面为63.0 +/- 4.1 (stat) +/- 3.0 (syst+lumi) pb，与标准模型预测的66.8(-3.1)(+2.9) pb一致。