Exploring the partonic phase at finite chemical potential within an extended off‐shell transport approach
- We extend the parton‐hadron‐string dynamics (PHSD) transport approach in the partonic sector by explicitly calculating the total and differential partonic scattering cross sections as a function of temperature T and baryon chemical potential μB on the basis of the effective propagators and couplings from the dynamical quasiparticle model (DQPM) that is matched to reproduce the equation of state of the partonic system above the deconfinement temperature Tc from lattice quantum chromodynamics (QCD). We calculate the collisional widths for the partonic degrees of freedom at finite T and μB in the time‐like sector and conclude that the quasiparticle limit holds sufficiently well. Furthermore, the ratio of shear viscosity η over entropy density s, that is, η/s, is evaluated using the collisional widths and compared to lattice QCD(lQCD) calculations for μB = 0 as well. We find that the ratio η/s does not differ very much from that calculated within the original DQPM on the basis of the Kubo formalism. Furthermore, there is only a very modest change of η/s with the baryon chemical μB as a function of the scaled temperature T/Tc(μB). This also holds for a variety of hadronic observables from central A + A collisions in the energy range 5 GeV urn:x-wiley:00046337:media:asna201913708:asna201913708-math-0001 200 GeV when implementing the differential cross sections into the PHSD approach. Accordingly, it will be difficult to extract finite μB signals from the partonic dynamics based on “bulk” observables.
Author: | Elena L. BratkovskayaORCiDGND, Wolfgang CassingGND, Pierre MoreauORCiDGND, Lucia OlivaORCiD, Olga SolovevaORCiDGND, Taesoo SongORCiDGND |
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URN: | urn:nbn:de:hebis:30:3-565170 |
DOI: | https://doi.org/10.1002/asna.201913708 |
ISSN: | 1521-3994 |
ISSN: | 0004-6337 |
Parent Title (German): | Astronomische Nachrichten = Astronomical notes |
Publisher: | Wiley‐VCH GmbH. |
Place of publication: | Berlin |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2019/12/18 |
Date of first Publication: | 2019/12/18 |
Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Release Date: | 2020/12/06 |
Tag: | heavy ions; quark‐gluon plasm; transport models |
Volume: | 340 |
Issue: | 9-10 |
Page Number: | 7 |
First Page: | 885 |
Last Page: | 891 |
HeBIS-PPN: | 476030625 |
Institutes: | Physik / Physik |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Sammlungen: | Universitätspublikationen |
Licence (German): | Creative Commons - Namensnennung 4.0 |