Top partners are well motivated in many new physics models. Usually, vector like quarks, , are introduced to circumvent the quantum anomaly. Therefore, it is crucial to probe their interactions with standard model particles. However, flavor changing neutral couplings are always difficult to detect directly in current and future experiments. In this paper, we demonstrate how to constrain the flavor changing neutral Yukawa coupling indirectly, via the di-Higgs production. We consider the simplified model, including a pair of gauge singlet . Under the perturbative unitarity and experimental constraints, we select , and as benchmark points. After the analysis on the amplitude and evaluation of the numerical cross sections, we infer that the present constraints from di-Higgs production have already surpassed the unitarity bound because of the behavior. For the case of and , and can be bounded optimally in the range at the HL-LHC with CL. For the case of and , and can be bounded optimally in the range at the HL-LHC with CL. The anomalous triple Higgs coupling can also affect the constraints on . Finally, we determine that the top quark electric dipole moment can provide stronger bounds in the off-axis regions for some scenarios.

顶级合作伙伴在许多新的物理模型中都有很好的动力。通常，引入像夸克这样的向量来规避量子异常。因此，探测它们与标准模型粒子的相互作用是至关重要的。然而，在当前和未来的实验中，改变风味的中性耦合总是难以直接检测到。在本文中，我们展示了如何通过 di-Higgs 产生间接约束风味变化的中性 Yukawa 耦合。我们考虑简化模型，包括一对规范单线态。根据微扰单一性和实验的限制，我们选择和 作为基准点。在对数值横截面的幅度和评估进行分析后，我们推断目前 di-Higgs 产生的约束已经超过了由于行为的单一性界限。为的情况下和，并且可以在的范围内最佳地限定在HL-LHC与CL。为的情况下和，并且可以在的范围内最佳地限定在HL-LHC与CL。异常三重希格斯耦合也会影响 上的约束。最后，我们确定顶夸克电偶极矩可以在某些情况下在离轴区域提供更强的界限。