We analyze the prospects of probing the C P -odd $$ i\tilde{\kappa}\overline{t}\gamma $$5th interaction at the LHC and its projected upgrades, the high-luminosity and high-energy LHC, directly using associated on-shell Higgs boson and top quark or top quark pair production. To this end we first construct a C P -odd observable based on top quark polarization in Wb → th scattering with optimal linear sensitivity to $$ \tilde{\kappa} $$. For the corresponding hadronic process pp → thj we present a method of extracting the phase-space dependent weight function that allows to retain close to optimal sensitivity to $$ \tilde{\kappa} $$. We project future sensitivity to the signal in pp → t(→ l𝜈b)h(→ b$$ \overline{b} $$)j. We also propose novel C P -odd observables for top quark pair production in association with the Higgs, pp → t$$ \overline{t} $$h, with semileptonically decaying tops and h → b$$ \overline{b} $$, that rely solely on measuring the momenta of leptons and b-jets from the decaying tops without having to distinguish the charge of the b-jets. Among the many possibilities we single out an observable that can potentially probe $$ \tilde{\kappa} $$ ∼ 0.1 at the high-energy LHC with 2𝜎 confidence.

中文翻译：

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在强子对撞机上探索顶夸克汤川的 CP 性质

我们分析了在 LHC 上探测 CP -odd $$ i\tilde{\kappa}\overline{t}\gamma $$5th 相互作用的前景及其预计的升级，高光度和高能 LHC，直接使用相关的壳上希格斯玻色子和顶夸克或顶夸克对的产生。为此，我们首先基于 Wb → th 散射中的顶夸克极化构建了一个 CP 奇可观测值，对 $$\tilde{\kappa} $$ 具有最佳线性灵敏度。对于相应的强子过程 pp → thj，我们提出了一种提取相空间相关权重函数的方法，该方法允许保持对 $$ \tilde{\kappa} $$ 的接近最佳灵敏度。我们在 pp → t(→ l𝜈b)h(→ b$$ \overline{b} $$)j 中预测未来对信号的敏感性。我们还提出了与希格斯粒子相关的顶夸克对产生的新 CP -odd 观测值，pp → t$$ \overline{t} $$h，具有半轻衰减顶部和 h → b$$ \overline{b} $$，这仅依赖于测量来自衰减顶部的轻子和 b 喷流的动量，而不必区分 b 喷流的电荷。在众多可能性中，我们挑选出一个可以在高能 LHC 上以 2𝜎 置信度探测 $$ \tilde{\kappa} $$ ∼ 0.1 的观测值。