Octagon at finite coupling
Octagon at finite coupling
A bstract We study a special class of four-point correlation functions of infinitely heavy half-BPS operators in planar $$ \mathcal{N} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>N</mml:mi> </mml:math> = 4 SYM which admit factorization into a product of two octagon form factors. We demonstrate that these functions satisfy a system of nonlinear integro-differential …