论文标题
$ t \ bar {t}的测量$ pp $ collisisions $ \ sqrt {s} = 5.02 $ tev带Atlas detector
Measurement of the $t\bar{t}$ production cross-section in $pp$ collisions at $\sqrt{s}=5.02$ TeV with the ATLAS detector
论文作者
论文摘要
包容性顶级对（$ t \ bar {t} $）生产横截面$σ_{t \ bar {t}} $在质子 - 普罗顿碰撞中以257 pb $^{ - 1}的限制为lhas，在Proton-Proton碰撞中测量质子 - 质量$ \ sqrt {s} = 5.02 $ tev，使用257 pb $^{ - sqrt {s} = 5.02 $。 $ t \ bar {t} $横截面是在$ t \ bar {t} $系统的Dilepton和单勒普顿最终状态中测量的，然后合并。这两个测量值的组合产生$σ_{t \ bar {t}} = 67.5 \ pm 0.9 \ text {（stat。）} \ pm 2.3 \ pm 2.3 \ text {（syst。实验和理论系统效应，以及对综合光度和LHC束能量的不完善知识，总不确定性为3.9％。结果与在强耦合常数下以近代到领导顺序的理论量子染色体计算一致，包括重新启动近隔至领先的对数软蛋白项，并限制大型bjorken-bjorken-$ x $ proton的parton分布功能。
The inclusive top-quark pair ($t\bar{t}$) production cross-section $σ_{t\bar{t}}$ is measured in proton-proton collisions at a centre-of-mass energy $\sqrt{s}=5.02$ TeV, using 257 pb$^{-1}$ of data collected in 2017 by the ATLAS experiment at the LHC. The $t\bar{t}$ cross-section is measured in both the dilepton and single-lepton final states of the $t\bar{t}$ system and then combined. The combination of the two measurements yields $σ_{t\bar{t}} = 67.5 \pm 0.9\text{(stat.)} \pm 2.3 \text{(syst.)} \pm 1.1\text{(lumi.)} \pm 0.2\text{(beam)}$ pb, where the four uncertainties reflect the limited size of the data sample, experimental and theoretical systematic effects, and imperfect knowledge of both the integrated luminosity and the LHC beam energy, giving a total uncertainty of 3.9%. The result is in agreement with theoretical quantum chromodynamic calculations at next-to-next-to-leading order in the strong coupling constant, including the resummation of next-to-next-to-leading logarithmic soft-gluon terms, and constrains the parton distribution functions of the proton at large Bjorken-$x$.
