Anisotropic flow of the fireball fed by hard partons

TL;DR

This paper demonstrates through hydrodynamic simulations that hard partons depositing momentum into the quark-gluon plasma significantly influence the anisotropic flow, especially increasing elliptic flow in non-central nuclear collisions.

Contribution

It introduces a novel mechanism where hard partons create streams in the plasma that merge, affecting flow anisotropy and linking it to the fireball geometry.

Findings

Hard partons contribute measurably to flow anisotropy.

Merging streams from close hard partons increase elliptic flow.

Flow anisotropy correlates with fireball geometry.

Abstract

In nuclear collisions at highest accessible LHC energies, often more than one dijet pairs deposit momentum into the deconfined expanding medium. With the help of 3+1 dimensional relativistic hydrodynamic simulation we show that this leads to measurable contribution to the anisotropy of collective transverse expansion. Hard partons generate streams in plasma which merge if they come close to each other. This mechanism correlates the resulting contribution to flow anisotropy with the fireball geometry and causes an increase of the elliptic flow in non-central collisions.