The effect of momentum deposition during fireball evolution on flow anisotropy

Abstract

Abstract. The highest LHC energies give rise to production of many pairs of hard partons which deposit four-momentum into the expanding fireball matter. We argue that it is necessary to include momentum deposition during fireball evolution into 3+1 dimensional hydrodynamic simulations of the collision. This influence cannot be accounted for simply by modifying initial conditions of the simulation. The resulting contribution to flow anisotropy is correlated with the fireball geometry and causes an increase of the elliptic flow in non-central collisions. The results are presented for various scenarios with energy and momentum deposition to clearly demonstrate this effect.

Flow anisotropy due to momentum deposition in ultra-relativistic nuclear collisions

“…Nevertheless, neither this set of initial conditions did reproduce the results from the simulations with jets. We conclude that momentum deposition during the evolution of the fireball cannot be mimicked by an augmented set of initial conditions [7].…”