Linearized Boltzmann transport model for jet propagation in the quark-gluon plasma: Heavy quark evolution

Abstract

A Linearized Boltzmann Transport (LBT) model coupled with hydrodynamical background is established to describe the evolution of jet shower partons and medium excitations in high energy heavy-ion collisions. We extend the LBT model to include both elastic and inelastic processes for light and heavy partons in the quark-gluon plasma. A hybrid model of fragmentation and coalescence is developed for the hadronization of heavy quarks. Within this framework, we investigate how heavy flavor observables depend on various ingredients, such as different energy loss and hadronization mechanisms, the momentum and temperature dependences of the transport coefficients, and the radial flow of the expanding fireball. Our model calculations show good descriptions of the D meson suppression and elliptic flow observed at the LHC and RHIC. The prediction for the Pb-Pb collisions at √ sNN=5.02 TeV is provided.

Angular structure of jet quenching within a hybrid strong/weak coupling model

“…Something similar can happen at weak coupling even though the energy is initially lost by gluon radiation because these radiated gluons can experience a cascade of reinteractions that converts the energy into soft particles at large angles [150][151][152][153][154][155][156]. The effects of both transverse momentum broadening [85,86,[107][108][109] and the backreaction of the medium [95,[157][158][159][160][161][162] on jet observables have also been studied within the context of perturbative energy loss mechanisms.…”

“…It is inevitable that when a jet reconstruction algorithm is used to find and reconstruct jets in heavy ion collisions, some of the energy and momentum that is counted as part of a jet in fact comes from hadrons formed from the plasma as it freezes out, given that the plasma includes a moving heated wake that, by momentum conservation, is flowing in the same direction as the jet [95,158,[160][161][162]. Furthermore, since any background subtraction procedure involves comparing events with a jet or jets to events that do not contain jets, and since events that do not contain jets also do not contain wakes, the particles from the hadronization of the wake that end up reconstructed as part of a jet will not be removed by background subtraction.…”

Event-by-event correlations between soft hadrons and D0 mesons in 5.02 TeV PbPb collisions at the CERN Large Hadron Collider

“…The difference between the charm and bottom quark masses suggests that, at low-p T , the D 0 meson v n should be larger than the corresponding coefficients for B 0 mesons [23]. Additionally, at low-p T quark coalescence [24][25][26] between heavy and light flavors [27,28] can substantially increase the elliptic flow of heavy mesons [29,30], as well as various effects such as Langevin type behavior and hadronic rescattering.…”

Heavy-flavor production and medium properties in high-energy nuclear collisions --What next?

“…In the last years, several groups have advanced approaches, which study the interaction of heavy quarks in an expanding QGP [61,[89][90][91][130][131][132][133][134][135][136][137][138][139][140][141][142][143][144]. These approaches are either based on a Fokker-Planck equation or on the use of the full Boltzmann collision kernel to describe the collisions of heavy quarks with the partons of the QGP.…”