  We study unequal rapidity correlators in the stochastic Langevin picture of
Jalilian-Marian-Iancu-McLerran-Weigert-Leonidov-Kovner (JIMWLK) evolution in
the Color Glass Condensate effective field theory. We discuss a diagrammatic
interpretation of the long-range correlators. By separately evolving the Wilson
lines in the direct and complex conjugate amplitudes, we use the formalism to
study two-particle production at large rapidity separations. We show that the
evolution between the rapidities of the two produced particles can be expressed
as a linear equation, even in the full nonlinear limit. We also show how the
Langevin formalism for two-particle correlations reduces to a BFKL picture in
the dilute limit and in momentum space, providing an interpretation of BFKL
evolution as a stochastic process for color charges.
