  We revisited the first saturation correction to projectile in nucleus-nucleus
collisions \cite{Chirilli:2015tea} within diagrammatic light cone perturbation
theory (LCPT). To get an analytic expression for the saturation correction in
projectile authors in \cite{Chirilli:2015tea} calculated complete
${\cal{O}}(g^3)$ amplitudes, where the main results are given in transverse
coordinate space. However to find the complete first saturation correction in
the projectile, one needs to calculate both ${\cal{O}}(g^3)$ and
${\cal{O}}(g^5)$ gluon production amplitudes. We here present a detailed
calculation of a sample graph at ${\cal{O}}(g^5)$ in diagrammatic light cone
perturbation theory.
