Charged hadron R_AA as a function of p_T at the LHC

TL;DR

This paper calculates the nuclear suppression factor R_AA for charged hadrons at LHC energies using a hydrodynamical model for the medium and perturbative QCD for initial parton spectra, providing insights into parton energy loss mechanisms.

Contribution

It introduces a combined approach using hydrodynamics and LO pQCD to model R_AA at LHC, incorporating a saturation-based initial condition and radiative energy loss.

Findings

R_AA computed as a function of p_T at LHC energies

Hydrodynamical evolution effectively models the soft medium

Initial conditions based on minijet + saturation are consistent with data

Abstract

We compute the nuclear suppression factor R_AA for charged hadrons within a radiative energy loss picture using a hydrodynamical evolution to describe the soft medium inducing energy loss. A minijet + saturation picture provides initial conditions for LHC energies and leading order perturbative QCD (LO pQCD) is used to compute the parton spectrum before distortion by energy loss.