论文标题
$ pp \ rightarrow t \ bar {t} $生产$ \ sqrt {s} = 13 $ tev带有Atlas detector
Evidence for the charge asymmetry in $pp \rightarrow t\bar{t}$ production at $\sqrt{s}= 13$ TeV with the ATLAS detector
论文作者
论文摘要
顶级抗距离（$ t \ bar {t} $）的包含和差异测量值收取不对称$ a_ \ text {c}^{t \ bar {t}} $和轻质差异$ a_ \ a_ \ a_ \ a_ \ a_ \ text {c} $ \ sqrt {s} = 13 $ tev由Atlas实验记录在CERN大型强子对撞机上。该测量使用完整的运行2个数据集，对应于139 fb $^{ - 1} $的集成光度，将数据组合在单级和Dilepton通道中，并采用了适合于已解决的拓扑和增强拓扑的重建技术。执行贝叶斯展开程序以纠正检测器的分辨率和接受效应。合并的包含$ t \ bar {t} $充电不对称为$ a_ \ text {c}^{t \ bar {t}} = 0.0068 \ pm 0.0015 $，它与零的不同，以4.7标准偏差为4.7。差异测量是作为不变质量，横向动量和$ t \ bar {t} $系统的纵向提升的函数进行的。在量子染色体动力学扰动理论中，包含和差异测量与标准模型预测兼容，并在近代到领先的顺序上进行了次要领先的级电子校正。测量值在标准模型有效场理论的框架中解释，并将竞争性界限放在几个威尔逊系数上。
Inclusive and differential measurements of the top-antitop ($t\bar{t}$) charge asymmetry $A_\text{C}^{t\bar{t}}$ and the leptonic asymmetry $A_\text{C}^{\ell\bar{\ell}}$ are presented in proton-proton collisions at $\sqrt{s} = 13$ TeV recorded by the ATLAS experiment at the CERN Large Hadron Collider. The measurement uses the complete Run 2 dataset, corresponding to an integrated luminosity of 139 fb$^{-1}$, combines data in the single-lepton and dilepton channels, and employs reconstruction techniques adapted to both the resolved and boosted topologies. A Bayesian unfolding procedure is performed to correct for detector resolution and acceptance effects. The combined inclusive $t\bar{t}$ charge asymmetry is measured to be $A_\text{C}^{t\bar{t}} = 0.0068 \pm 0.0015$, which differs from zero by 4.7 standard deviations. Differential measurements are performed as a function of the invariant mass, transverse momentum and longitudinal boost of the $t\bar{t}$ system. Both the inclusive and differential measurements are found to be compatible with the Standard Model predictions, at next-to-next-to-leading order in quantum chromodynamics perturbation theory with next-to-leading-order electroweak corrections. The measurements are interpreted in the framework of the Standard Model effective field theory, placing competitive bounds on several Wilson coefficients.
