Journalartikel

Jahr der Veröffentlichung: 2008

Zeitschrift: Physical Review C

Bandnummer: 78

Heftnummer: 3

ISSN: 0556-2813

eISSN: 1089-490X

Open Access Status: Green

DOI Link: https://doi.org/10.1103/PhysRevC.78.034919

Verlag: American Physical Society

Abstract: 
The hadronization of an expanding partonic fireball is studied within the parton-hadron-string-dynamics (PHSD) approach, which is based on a dynamical quasiparticle model (DQPM) matched to reproduce lattice QCD results in thermodynamic equilibrium. Apart from strong parton interactions, the expansion and development of collective flow is driven by strong gradients in the parton mean fields. An analysis of the elliptic flow v(2) demonstrates a linear correlation with the spatial eccentricity epsilon as in ideal hydrodynamics. The hadronization occurs by quark-antiquark fusion or three-quark/three-antiquark recombination, which is described by covariant transition rates. Since the dynamical quarks become very massive, the formed resonant "pre-hadronic" color-dipole states (q (q) over bar or qqq) are of high invariant mass, too, and sequentially decay to the ground-state meson and baryon octets increasing the total entropy. This solves the entropy problem in hadronization in a natural way. The resulting particle ratios turn out to be in line with those from a grand-canonical partition function at temperature T approximate to 170 MeV rather independent from the initial temperature and indicate an approximate strangeness equilibration.

Harvard-Zitierstil: Cassing, W. and Bratkovskaya, E. (2008) Parton transport and hadronization from the dynamical quasiparticle point of view, Physical Review C, 78(3), Article 034919. https://doi.org/10.1103/PhysRevC.78.034919

APA-Zitierstil: Cassing, W., & Bratkovskaya, E. (2008). Parton transport and hadronization from the dynamical quasiparticle point of view. Physical Review C. 78(3), Article 034919. https://doi.org/10.1103/PhysRevC.78.034919