论文标题
倾向QED Beta功能和Renormalons $ 1/n_f^2 $和$ 1/n_f^3 $
Towards the QED beta function and renormalons at $1/N_f^2$ and $1/N_f^3$
论文作者
论文摘要
我们确定$ 1/n_f^2 $和$ 1/n_f^3 $的贡献，该QED beta功能来自封闭的嵌套图集。与$ 1/n_f $结果相比，在订单$ 1/n_f^2 $中，我们发现了一个新的对数分支切割，更接近原点。相同的奇点位置出现在$ 1/n_f^3 $中，这些位置对应于光子两点函数的有限部分中的紫外线肾上数奇异性。
We determine the $1/N_f^2$ and $1/N_f^3$ contributions to the QED beta function stemming from the closed set of nested diagrams. At order $1/N_f^2$ we discover a new logarithmic branch-cut closer to the origin when compared to the $1/N_f$ results. The same singularity location appears at $1/N_f^3$, and these correspond to a UV renormalon singularity in the finite part of the photon two-point function.
