  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. 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.
