标题： 单环形式因子对于 $H\rightarrow γ^*γ^*$ 在 $R_ξ$ 规范中 显示英文标题

标题： One-loop form factors for $H\rightarrow γ^*γ^*$ in $R_ξ$ gauge

摘要： 在本文中，我们给出了在$R_ξ$规范下$H\rightarrow γ^* γ^*$的一般单圈形式因子，考虑了最终光子的两种在壳、一种在壳和两种非在壳的所有情况。 计算是在标准模型以及任意超出标准模型的情况中进行的，其中可能在单圈图中交换带电标量粒子。 形式因子的解析结果以 Passarino-Veltman 函数表示的一般形式展示。 我们还确认了之前计算的结果，这些结果适用于两种在壳光子的情况。 结果中与$ξ$无关的部分也进行了讨论。 我们发现数值结果在变化$ξ=0,1$和$ξ\rightarrow \infty$时具有良好的稳定性。 显示英文摘要

摘要： In this paper, we present general one-loop form factors for $H\rightarrow γ^* γ^*$ in $R_ξ$ gauge, considering all cases of two on-shell, one on-shell and two off-shell for final photons. The calculations are performed in standard model and in arbitrary beyond the standard models which charged scalar particles may be exchanged in one-loop diagrams. Analytic results for the form factors are shown in general forms which are expressed in terms of the Passarino-Veltman functions. We also confirm the results in previous computations which are available for the case of two on-shell photons. The $ξ$-independent of the result is also discussed. We find that numerical results are good stability with varying $ξ=0,1$ and $ξ\rightarrow \infty$.