Abstract
We discuss the propagation of heavy quarks (charm and bottom) through the QGP by means of a relativistic Boltzmann transport approach including both collisional and radiative energy loss mechanisms. In particular we investigate the impact of induced gluon radiation by dynamical QCD medium implementing in our transport model a formula for the emitted gluon spectrum calculated in a higher-twist scheme. We notice that in the region of high transverse momentum (pT > 10 GeV) radiative processes play an essential role giving a dominant contribution to the generation of RAA and v2 at momentum values for which the energy loss by collisions is in the perturbative regime.
Highlights
Heavy quarks (HQs) represent an ideal probe for investiganting the properties of hot and dense QCD matter created at ultra-Relativistic Heavy Ion Collisions
Both observables have been measured at RHIC and LHC facilities [1] [2] and the challenge of each theoretical framework is to give a consistent explanation of the surprising low RAA and high v2 observed in the HQ sector, solving the so called RAA − v2
It is well know that pQCD alone is not able to reproduce the quenching in HQ sector
Summary
Heavy quarks (HQs) represent an ideal probe for investiganting the properties of hot and dense QCD matter created at ultra-Relativistic Heavy Ion Collisions (uRHICs) They are created at early stages of collisions and due to their large masses they have a large thermalization time with respect to the bulk medium. The two key observables in HQ sector are the nuclear suppression factor RAA(pT ), i.e. the ratio between the spectra of heavy flavor hadrons and their decay products measured in nucleus-nucleus collisions with the same spectra in proton-proton ones, and the elliptic flow v2(pT ) which is a measure of the developed anisotropies in the angular distributions in momentum space Both observables have been measured at RHIC and LHC facilities [1] [2] and the challenge of each theoretical framework is to give a consistent explanation of the surprising low RAA and high v2 observed in the HQ sector, solving the so called RAA − v2
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