TY  - JOUR
A1  - Bratkovskaya, Elena L.
A1  - Cassing, Wolfgang
A1  - Moreau, Pierre
A1  - Oliva, Lucia
A1  - Soloveva, Olga
A1  - Song, Taesoo
T1  - Exploring the partonic phase at finite chemical potential within an extended off‐shell transport approach
T2  - Astronomische Nachrichten = Astronomical notes
N2  - 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.
KW  - heavy ions
KW  - quark‐gluon plasm
KW  - transport models
Y1  - 2019
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/56517
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-565170
SN  - 1521-3994
SN  - 0004-6337
VL  - 340
IS  - 9-10
SP  - 885
EP  - 891
PB  - Wiley‐VCH GmbH.
CY  - Berlin
ER  -