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Abstract We discuss the angular correlation present in hadron–hadron collisions at large rapidity difference ( $$\bar{\alpha }_S\,y_{12}\gg \,1$$ α ¯ S y 12 ≫ 1 ). We find that in the CGC/saturation approach the largest contribution stems from the density variation mechanism. Our principal results are that the odd Fourier harmonics ( $$v_{2n+1}$$ v 2 n + 1 ) decrease substantially as a function of $$y_{12}$$ y 12 , while the even harmonics ( $$v_{2n}$$ v 2 n ) increase considerably with the growth of $$y_{12}$$ y 12 .