2 problems

Consider the method-of-regions analysis of the large-$x_4$ limit of conformal Witten diagrams, including the region obtained by rescaling $\alpha_4\to\alpha_4/x_4^2$ while the othe…

Let $x_1=0$, $x_2=e$, and $x_4\to\infty$ in a four-point Witten diagram, with cross-ratios $\eta=x_3^2$ and $\xi=(e-x_3)^2$. In the Witten–Feynman parameter representation, conside…