Azimuthal angle correlations at large rapidities: revisiting density variation mechanism

TL;DR

This paper investigates azimuthal angle correlations at large rapidities in hadron collisions, revealing that density variation significantly influences harmonic behaviors, with odd harmonics decreasing and even harmonics increasing as rapidity difference grows.

Contribution

It demonstrates that the density variation mechanism dominates azimuthal correlations in the CGC/saturation framework at large rapidities, providing new insights into harmonic behavior.

Findings

Odd Fourier harmonics decrease with increasing rapidity difference.

Even Fourier harmonics increase with increasing rapidity difference.

Density variation mechanism is the primary contributor to angular correlations.

Abstract

In the paper we discuss the angular correlation present in hadron-hadron collisions at large rapidity difference ($\bas\,y_{12}\,\gg\,1$). 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 function of $y_{12}$, while the even harmonics ($v_{2n}$ ), increase considerably with a growth of $y_{12}$.