Heavy flavour in nucleus-nucleus collisions at RHIC and LHC: a Langevin approach

A Beraudo,M Monteno,F Prino,A De Pace,M Nardi,A Molinari,W.M Alberico,S Lunardi,R Menegazzo,P Di Nezza,M Chiari,J.J Valiente-Dobon,C Signorini,A Nannini,P.G Bizzeti,A Dainese,C Bucci

doi:10.1051/epjconf/20146604004

Abstract

A snapshot of the results for heavy-flavour observables in heavy-ion (AA) collisions at RHIC and LHC obtained with our transport calculations is displayed. The initial charm and beauty production is simulated through pQCD tools (POWHEG+PYTHIA) and is validated through the comparison with data from pp collisions. The propagation of c and b quarks in the medium formed in heavy-ion collisions is studied through a transport setup based on the relativistic Langevin equation. With respect to past works we perform a more systematic study, providing results with different choices of transport coefficients, either from weak-coupling calculations or from lattice-QCD simulations. Our findings are compared to a rich set of experimental data (D-mesons, non-photonic electrons, non-prompt J/\psi's) which have meanwhile become accessible.

Highlights

IntroductionThe heavy-ion program of all the detectors at RHIC and LHC nowadays include different heavyflavour measurements which, all together, provide a rich experimental information challenging the various theoretical models to consistently reproduce such a wide set of data
The heavy-ion program of all the detectors at RHIC and LHC nowadays include different heavyflavour measurements which, all together, provide a rich experimental information challenging the various theoretical models to consistently reproduce such a wide set of data.Heavy quarks, produced in the initial stage in hard pQCD processes, after comparing the findings in pp and AA collisions allow one to perform a tomography of the Quark Gluon Plasma (QGP) produced in heavy-ion experiments
At the same time the detailed information on the medium provided independently by hydrodynamic studies of soft observables can be exploited to put tight constraints on the interaction between the heavy quarks and the plasma, which must lead to the observed amount of quenching and azimuthal asymmetry of the final spectra

Summary

Introduction

The heavy-ion program of all the detectors at RHIC and LHC nowadays include different heavyflavour measurements which, all together, provide a rich experimental information challenging the various theoretical models to consistently reproduce such a wide set of data. The fact that each model addresses the above issues in a different (sometimes schematic) way makes a comparison of the different calculations difficult and the question of constraining the interaction between the heavy quarks and the rest of the plasma hard to answer. For independent approaches we refer the reader to Refs. [3,4,5,6]

The setup

Results

Conclusions and outlook