# Azimuthal angle correlations at large rapidities: revisiting density variation mechanism

The European Physical Journal C, Nov 2017

We discuss the angular correlation present in hadron–hadron collisions at large rapidity difference ($$\bar{\alpha }_S\,y_{12}\gg \,1$$). 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 ($$v_{2n+1}$$) decrease substantially as a function of $$y_{12}$$, while the even harmonics ($$v_{2n}$$) increase considerably with the growth of $$y_{12}$$.

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E. Gotsman, E. Levin. Azimuthal angle correlations at large rapidities: revisiting density variation mechanism, The European Physical Journal C, 2017, 773, DOI: 10.1140/epjc/s10052-017-5350-3