Rapidity dependence of elliptic and triangular flow in proton-nucleus collisions from collective dynamics

TL;DR

This paper predicts how elliptic and triangular flow coefficients vary with rapidity in proton-nucleus collisions using hydrodynamics and transport models, revealing asymmetries between the proton and nucleus sides.

Contribution

It provides the first detailed prediction of rapidity dependence of flow coefficients in p+A collisions from both hydrodynamic and transport perspectives.

Findings

Flow coefficients are larger on the nucleus side than on the proton side.

The ratio of flow coefficients between nucleus and proton sides weakly depends on transverse momentum.

Both models agree on the qualitative rapidity dependence of flow.

Abstract

The rapidity dependence of elliptic, $v_2$, and triangular, $v_3$, flow coefficients in proton-nucleus (p+A) collisions is predicted in hydrodynamics and in a multi-phase transport model (AMPT). We find that $v_n$ ($n=2,3$) on a nucleus side is significantly larger than on a proton side and the ratio between the two, $v_n^{\rm Pb}/v_n^{\rm p}$, weekly depends on the transverse momentum of produced particles.