论文标题
$ t \ bar {t} h $进程中的$ cp $ -odd效果的优化探针
Optimized probes of $CP$-odd effects in the $t \bar{t} h$ process at hadron colliders
论文作者
论文摘要
我们使用机器学习（ML）和非ML技术来研究优化的$ cp $ -odd可观察物，直接和最大敏感，对$ cp $ -odd $ i \ tildek \ bartγ^5 t h $相互作用在LHC和LHC上的相互作用，并使用Higgs Boson和a $ a $ bar by by $ bar by b by b by by，半蛋白质$ t $衰减。我们对明显的$ CP $ -ODD可观察值（$ \ boldsymbolω$）进行相位空间优化，对$ \tildeκ$的符号敏感，并根据实验可访问的最终状态矩构建。我们确定了一个简单的优化线性组合$ \boldsymbolα\ cdot \boldsymbolΩ$，它具有与所研究的完全刚刚刚起步的ML模型相似的灵敏度。使用$ \boldsymbolα\ cdot \boldsymbolΩ$，我们将预期灵敏度投射到HL-LHC，HE-LHC和FCC-HH的$ \tildeκ$。
We use machine learning (ML) and non-ML techniques to study optimized $CP$-odd observables, directly and maximally sensitive to the $CP$-odd $i \tilde κ\bar t γ^5 t h$ interaction at the LHC and prospective future hadron colliders using the final state with a Higgs boson and a top quark pair, $pp\to t\bar t h$, followed by semileptonic $t$ decays. We perform phase-space optimization of manifestly $CP$-odd observables ($\boldsymbol ω$), sensitive to the sign of $\tilde κ$, and constructed from experimentally accessible final state momenta. We identify a simple optimized linear combination $\boldsymbol α\cdot \boldsymbolω$ that gives similar sensitivity as the studied fully fledged ML models. Using $\boldsymbolα\cdot \boldsymbolω$ we project the expected sensitivities to $\tilde κ$ at HL-LHC, HE-LHC, and FCC-hh.
