Contribution to a conference proceedings/Contribution to a book

GSI-2021-00223

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Open charm and dileptons from relativistic heavy-ion collisions

Bratkovskaya, E. (Corresponding author)GSI* ; Song, T. ; Moreau, P. ; Greiner, C.

2021
Sissa Medialab Trieste, Italy

Please use a persistent id in citations: doi:10.22323/1.387.0090  doi:10.15120/GSI-2021-00223

Report No.: 2009.00040

Abstract: We study the dynamics of open charm production and the dilepton radiation of the semi-leptonic decays of correlated $D\bar D$ pairs versus the quark-gluon plasma (QGP) radiation and hadronic sources in relativistic heavy-ion collisions. Our study is based on the Parton-Hadron-String Dynamics (PHSD) transport approach employing a non-perturbative QCD description of the strongly interacting quark-gluon plasma (sQGP) in terms of dynamical quasiparticles and the EoS based on lattice QCD. We compare the PHSD results for charm observables with the calculations from BAMPS (Boltzmann Approach to Multi-Parton Scatterings) which is based on perturbative QCD with massless partons and interaction cross sections calculated in leading order of the QCD coupling. We compare the $p_T$ dependence of the ratio $R_{AA}$ of $D$-mesons in $A+A$ over $p+p$ collisions scaled by the number of binary collisions $N_{bin}$ as well as the elliptic flow $v_2$ of $D$-mesons calculated within the PHSD and BAMPS at LHC energies. In other study, based on the PHSD calculations we find that the dileptons from correlated $D-$meson semi-leptonic decays dominate the 'thermal' radiation from the QGP in central Pb+Pb collisions at the intermediate masses ($1.2 < M < 3$ GeV) for higher invariant energies However, for invariant energies $\sqrt{s_{NN}} < 40$ GeV the QGP radiation overshines the contribution from $D,{\bar D}$ decays such that one should observe a rather clear signal from the partonic dilepton radiation. This finding provides promising perspectives to measure the QGP radiation in the dilepton experiments at RHIC BES and the future FAIR/NICA facilities.

Note: 5 pages, 3 figures, Contribution to the 'Hard Probe-2020' Proceedings. Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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Contributing Institute(s):

1. Koordination Theorie GSI (THE)

Research Program(s):

1. 612 - Cosmic Matter in the Laboratory (POF3-612) (POF3-612)
2. CRC-TR211 - TRR 211 Strong-Interaction Matter Under Extreme Conditions (315477589) (315477589)

Experiment(s):

1. no experiment theory work (POF3; theory)

Appears in the scientific report 2020

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