Elliptic flow and RAA of D mesons at FAIR comparing the UrQMD hybrid model and the coarse-graining approach

  • We present a study of the elliptic flow and RAA of D and D¯ mesons in Au+Au collisions at FAIR energies. We propagate the charm quarks and the D mesons following a previously applied Langevin dynamics. The evolution of the background medium is modeled in two different ways: (I) we use the UrQMD hydrodynamics + Boltzmann transport hybrid approach including a phase transition to QGP and (II) with the coarse-graining approach employing also an equation of state with QGP. The latter approach has previously been used to describe di-lepton data at various energies very successfully. This comparison allows us to explore the effects of partial thermalization and viscous effects on the charm propagation. We explore the centrality dependencies of the collisions, the variation of the decoupling temperature and various hadronization parameters. We find that the initial partonic phase is responsible for the creation of most of the D/D¯ mesons elliptic flow and that the subsequent hadronic interactions seem to play only a minor role. This indicates that D/D¯ mesons elliptic flow is a smoking gun for a partonic phase at FAIR energies. However, the results suggest that the magnitude and the details of the elliptic flow strongly depend on the dynamics of the medium and on the hadronization procedure, which is related to the medium properties as well. Therefore, even at FAIR energies the charm quark might constitute a very useful tool to probe the quark–gluon plasma and investigate its physics.
Author:Gabriele InghiramiORCiDGND, Hendrik van HeesORCiDGND, Stephan EndresORCiDGND, Juan M. Torres-RinconORCiDGND, Marcus BleicherORCiDGND
Pubmed Id:https://pubmed.ncbi.nlm.nih.gov/30740033
Parent Title (English):The European physical journal. C, Particles and fields
Place of publication:Berlin ; Heidelberg
Document Type:Article
Year of Completion:2019
Date of first Publication:2019/01/21
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2019/03/21
Issue:1, Art. 52
Page Number:22
First Page:1
Last Page:22
Open Access: This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Institutes:Physik / Physik
Wissenschaftliche Zentren und koordinierte Programme / Helmholtz International Center for FAIR
Wissenschaftliche Zentren und koordinierte Programme / Frankfurt Institute for Advanced Studies (FIAS)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - Namensnennung 4.0