Heavy Quark Dynamics toward thermalization: RAA, υ1, υ2, υ3

Salvatore Plumari,Vincenzo Greco,Santosh K Das,Francesco Scardina,Vincenzo Minissale

doi:10.1051/epjconf/201817118014

Salvatore Plumari, Vincenzo Greco + Show 3 more

Open Access

https://doi.org/10.1051/epjconf/201817118014

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Abstract

We describe the propagation of Heavy quarks (HQs) in the quark-gluon plasma (QGP) within a relativistic Boltzmann transport (RBT) approach. The interaction between heavy quarks and light quarks is described within quasi-particle approach which is able to catch the main features of non-perturbative interaction as the increasing of the interaction in the region of low temperature near TC. In our calculations the hadronization of charm quarks in D mesons is described by mean of an hybrid model of coalescence plus fragmentation. We show that the coalescence play a key role to get a good description of the experimental data for the nuclear suppression factor RAA and the elliptic flow υ2(pT) at both RHIC and LHC energies. Moreover, we show some recent results on the direct flow υ1 and triangular flow υ3 of D meson.

Highlights

Charm and bottom quarks are produced at the early stages of a Heavy Ion Collision (HIC) and due to their large masses they are expected to thermalize slower in the quark-gluon plasma (QGP)
In the second part we discuss the recent results about the direct flow v1 and triangular flow v3(pT ) of D meson
We have studied the charm quark propagation in QGP at LHC energies within a relativistic Boltzmann transport approach

Summary

Introduction

Charm and bottom quarks are produced at the early stages of a Heavy Ion Collision (HIC) and due to their large masses they are expected to thermalize slower in the QGP They represent an ideal probe to study the whole evolution of the QGP. The nuclear suppression factor RAA, which is the ratio between the spectra of heavy flavor hadrons measured in nucleus-nucleus, and the elliptic flow v2(pT ) which is a measure of the anisotropies in momentum space are the two key observables in heavy flavor sector Experimental measurements at both RHIC and LHC energies have shown a small value of their RAA and the large values of v2(pT ) which are almost comparable to those of light hadrons. Several theoretical efforts within different models have been made to study and describe simultaneously the small RAA and large v2 measured in experiments [1,2,3,4,5,6] Recently this analysis has been extended to the study of different harmonics showing that a direct flow v1 and triangular flow v3(pT ) of D meson is non vanishing [7, 8]

Transport equation for charm quarks in the QGP

Results

Conclusions