We present the results for the anomalous chromomagnetic moment of a quark at the one-loop and two-loop levels through model-independent parameterizations, considering the external gluon to be off-shell. Then, we consider different types of two-Higgs-doublet models with the momentum transfer of the external gluon, , and 0, for the numerical evaluations thereof for the top quark. We find that the contributions in the two-Higgs-doublet models are on the order of at the one-loop level and at the two-loop level, where the one-loop and two-loop contributions interfere destructively, resulting in the overall contributions being on the order of with a positive sign.

中文翻译：

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双希格斯双峰模型中顶夸克反常色磁偶极矩的双环贡献


考虑到外部胶子处于离壳状态，我们通过与模型无关的参数化给出了夸克在单环和双环水平上的反常色磁矩的结果。然后，我们考虑不同类型的具有外部胶子动量传递的双希格斯双峰模型， 和 0，用于顶夸克的数值评估。我们发现双希格斯双峰模型中的贡献在单环水平和双环水平上大约为 ，其中一环和两环贡献破坏性地干扰，导致总体贡献的数量级为正号。