Bose-Einstein correlations and $\mathbf{v_{2n}}$ and $\mathbf{v_{2n-1}}$ in hadron and nucleus collisions

TL;DR

This paper demonstrates that Bose-Einstein correlations cause long-range azimuthal correlations in high-energy hadron and nucleus collisions, arising naturally from the CGC/saturation framework and independent of hydrodynamic assumptions.

Contribution

It introduces a general technique showing that both even and odd flow coefficients emerge naturally from Bose-Einstein correlations, challenging the exclusive attribution to hydrodynamics.

Findings

Bose-Einstein correlations produce long-range azimuthal correlations.

Both even and odd flow coefficients occur naturally.

Correlations are not solely due to hydrodynamical behavior.

Abstract

We show that Bose-Einstein correlations of identical particles in hadron and nucleus high energy collisions, lead to long range rapidity correlations in the azimuthal angle. These correlations are inherent features of the CGC/saturation approach, however, their origin is more general than this approach. In framework of the proposed technique both even and odd $v_n$ occur naturally, independent of the type of target and projectile. We are of the opinion that it is premature to conclude that the appearance of azimuthal correlations are due to the hydrodynamical behaviour of the quark-gluon plasma.