论文标题
量子SMEFT断层扫描：LHC的顶级夸克对生产
Quantum SMEFT tomography: top quark pair production at the LHC
论文作者
论文摘要
量子信息可观察的物品（例如纠缠措施）提供了一种表征量子状态特性的强大方法。我们建议使用它们来探测基本相互作用的结构，并在高能量下寻找新的物理。受到LHC在LHC上生产的顶级夸克对纠缠的最新建议的启发，我们研究了SMEFT中高维操作员如何修改标准模型期望。我们在标准模型产生最大纠缠状态的相空间中探索两个感兴趣的区域：在阈值和高能极限处。我们推出了一种非平凡的效果模式，该模式取决于初始状态部分，$ q \ bar q $或$ gg $，是仅包括线性还是二次SMEFT贡献，以及相位空间区域。通常，我们发现高维效应降低了标准模型中预测的纠缠。
Quantum information observables, such as entanglement measures, provide a powerful way to characterize the properties of quantum states. We propose to use them to probe the structure of fundamental interactions and to search for new physics at high energy. Inspired by recent proposals to measure entanglement of top quark pairs produced at the LHC, we examine how higher-dimensional operators in the framework of the SMEFT modify the Standard Model expectations. We explore two regions of interest in the phase space where the Standard Model produces maximally entangled states: at threshold and in the high-energy limit. We unveil a non-trivial pattern of effects, which depend on the initial state partons, $q\bar q$ or $gg$, on whether only linear or up to quadratic SMEFT contributions are included, and on the phase space region. In general, we find that higher-dimensional effects lower the entanglement predicted in the Standard Model.
