Elliptic flow and nuclear modification factor in ultra-relativistic heavy-ion collisions within a partonic transport model

Abstract

The quark gluon plasma produced in ultra-relativistic heavy-ion collisions exhibits remarkable features. It behaves like a nearly perfect liquid with a small shear viscosity to entropy density ratio and leads to the quenching of highly energetic particles. We show that both effects can be understood for the first time within one common framework. Employing the parton cascade Boltzmann Approach to Multi-Parton Scatterings (BAMPS), the microscopic interactions and the space-time evolution of the quark gluon plasma are calculated by solving the relativistic Boltzmann equation. Based on cross sections obtained from perturbative QCD with explicitly taking the running coupling into account, we calculate the nuclear modification factor and elliptic flow in ultra-relativistic heavy-ion collisions. With only one single parameter associated with coherence effects of medium-induced gluon radiation, the experimental data of both observables can be understood on a microscopic level. Furthermore, we show that perturbative QCD interactions with a running coupling lead to a sufficiently small shear viscosity to entropy density ratio of the quark gluon plasma, which provides a microscopic explanation for the observations stated by hydrodynamic calculations.

5 pages, 5 figures

References in corpus (13)

• PYTHIA 6.4 Physics and Manual
• Towards an understanding of the RHIC single electron data
• Open heavy flavor in Pb+Pb collisions at sqrt(s)=2.76 TeV within a transport model
• Perturbative QCD Calculations of Elliptic Flow and Shear Viscosity in Au+Au Collisions at $\sqrt{s_{NN}}=200$ GeV
• Shear Viscosity in a Gluon Gas
• Transport rates and momentum isotropization of gluon matter in ultrarelativistic heavy-ion collisions
• Elliptic flow of gluon matter in ultrarelativistic heavy-ion collisions
• A local Monte Carlo implementation of the non-abelian Landau-Pomerantschuk-Migdal effect
• Evolution of elliptic and triangular flow as a function of collision energy in a hybrid model
• Energy loss in a partonic transport model including bremsstrahlung processes
• Towards a Unified Understanding of Jet Quenching and Elliptic Flow within Perturbative QCD Parton Transport
• Dependence of elliptic flow on number of parton degrees of freedom
• Momentum imbalance of D mesons in ultra-relativistic heavy-ion collisions at LHC

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