Jet modification in 200 AGeV Au-Au collisions

Abstract

The computation of hard processes in hadronic collisions is a major success of perturbative Quantum Chromodynamics. The environment of heavy-ion collisions offers the opportunity to embed such hard processes into a soft medium which is created simultaneously and study the medium-induced modifications. On the level of single high transverse momentum hadrons, a reduction in yield, the so-called quenching is observed. However, on the level of jets, the energy-momentum flux carried by hadrons is conserved, i.e. the effect of the medium is a redistribution of energy and momentum, and statements about quenching of jets can only be made for specific cuts used to identify the jet. In this paper, we present a baseline computation for the expected modification of the longitudinal momentum distribution in jets by the medium created in 200 AGeV Au-Au collisions given a realistic set of experimental cuts used to identify jets in a heavy-iron environment. For this purpose, we use a Monte-Carlo code developed to simulate in-medium shower evolution following a hard process and a 3-d hydrodynamical evolution to simulate the soft medium.