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

Abstract

In this paper heavy quark energy loss models are embedded in full event-by-event viscous hydrodynamic simulations to investigate the nuclear suppression factor and the azimuthal anisotropy of D 0 mesons in PbPb collisions at √ sNN = 5.02 TeV in the pT range 8-40 GeV. In our model calculations, the RAA of D 0 mesons is consistent with experimental data from the cms experiment. We present the first calculations of heavy flavor cumulants v2{2} and v3{2} (and also discuss v2{4}), which is also consistent with experimental data. Event-shape engineering techniques are used to compute the event-by-event correlation between the soft hadron vn and the heavy meson vn. We predict a linear correlation between these observables on an event-by-event basis.

Heavy flavour dynamics in event-by-event viscous hydrodynamic backgrounds

“…The hadronization of the heavy quarks is performed either though fragmentation only (Peterson) [2], or through heavy-light quark coalescence. The latter is based on an instantaneous projection of the parton states onto hadron states [12,13], and the derived coalescence probabilities depend on the heavy-quark momentum, the local flow, and the angle between them.…”

“…Observables in the heavyflavor sector such as the nuclear modification factor R AA and azimuthal anisotropy coefficients v n of D and B mesons have been investigated both experimentally and theoretically [1], and there is a certain difficulty to describe both R AA and v 2 simultaneously. Here we present the 2D Monte Carlo D-And-B MODular simulation code DAB-mod, designed to study the production of open heavy mesons [2]. Using DAB-mod we study heavy-flavor multiparticle cumulants of azimuthal anisotropies [3] and compare results from different transport models within the same background.…”

Recent results on collectivity and correlations in heavy-ion collisions from ATLAS

“…The v 3 signal is smaller than the v 2 and shows a weaker variation over centrality. Experimental data are also compared to prediction from TAMU (transport of the heavy-flavor within the QGP) [14] and DABMod (energy-loss of heavy-flavor in the QGP) [15] models. DABMod gives better a description of v 2 than TAMU probably due to implementation of the event-by-event fluctuations into the model.…”

Sensitivity of D meson azimuthal anisotropies to system size and nuclear structure

“…In recent years it was found that a more realistic description of the QGP medium is a necessary tool for simultaneously reproducing the nuclear modification factor R AA and the high p T and heavy flavor azimuthal anisotropies v n {m}(p T ) [44,10,11,45]. Therefore we include a realistic event-by-event description of the medium coupled to modular heavy flavor code using Trento+v-USPhydro+DAB-MOD.…”

“…The hydrodynamic model is v-USPhydro [48,49,50] where we use the same parameters for LHC run 2 as in [51] where τ 0 = 0.6 fm, η/s ∼ 0.05, and T FO = 150 MeV. To describe the heavy flavor sector we run DAB-MOD [45] a modular Monte Carlo simulation that samples heavy quarks using distributions from pQCD FONLL calculations [52,53], implements either a parameterized energy loss model+energy loss fluctuations or a Langevin model, and then this is followed by fragmentation functions and coalescence to obtain the final particle yields.…”