标题： 在$\sqrt{s}$ = 13 TeV 的 pp 碰撞中搜索 CP 违反的顶夸克耦合 显示英文标题

标题： Search for CP violating top quark couplings in pp collisions at $\sqrt{s}$ = 13 TeV

摘要： 结果来自对顶夸克对产生中CP破坏的搜索，使用质子-质子碰撞，在质心系能量为13 TeV的情况下进行。 用于此分析的数据包括由CMS实验收集的两个带电轻子的最终状态，对应的积分亮度为35.9 fb$^{-1}$。 该搜索使用两个可观测量，$\mathcal{O}_1$和$\mathcal{O}_3$，它们是洛伦兹标量。 可观测量$\mathcal{O}_1$是从带电轻子和重建的顶夸克的四动量构建的，而$\mathcal{O}_3$包括来自顶夸克的带电轻子和b夸克的四动量。 这些可观测量中的不对称性对CP破坏敏感，其测量用于确定顶夸克的色电偶极矩。 结果与标准模型的预期一致。 显示英文摘要

摘要： Results are presented from a search for CP violation in top quark pair production, using proton-proton collisions at a center-of-mass energy of 13 TeV. The data used for this analysis consist of final states with two charged leptons collected by the CMS experiment, and correspond to an integrated luminosity of 35.9 fb$^{-1}$. The search uses two observables, $\mathcal{O}_1$ and $\mathcal{O}_3$, which are Lorentz scalars. The observable $\mathcal{O}_1$ is constructed from the four-momenta of the charged leptons and the reconstructed top quarks, while $\mathcal{O}_3$ consists of the four-momenta of the charged leptons and the b quarks originating from the top quarks. Asymmetries in these observables are sensitive to CP violation, and their measurement is used to determine the chromoelectric dipole moment of the top quark. The results are consistent with the expectation from the standard model.