Bulk matter evolution and extraction of jet transport parameters in heavy-ion collisions at energies available at the BNL Relativistic Heavy Ion Collider (RHIC)

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.81.064908· OSTI ID:21388626

Xiaofang, Chen ^[1]; Greiner, Carsten ^[2]; Enke, Wang ^[1]; Xinnian, Wang ^[2]; Zhe, Xu ^[2]

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1. Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics, Huazhong Normal University, Wuhan 430079 (China)
2. Institut fuer Theoretische Physik, Johann Wolfgang Goethe-Universitaet, Max-von-Laue-Strasse 1, D-60438 Frankfurt am Main (Germany)

Within the picture of jet quenching induced by multiple parton scattering and gluon bremsstrahlung, medium modification of parton fragmentation functions and therefore the suppression of large transverse-momentum hadron spectra are controlled by both the value and the space-time profile of the jet transport parameter along the jet propagation path. Experimental data on single-hadron suppression in high-energy heavy-ion collisions at the Relativistic Heavy Ion Collider energy are analyzed within the higher-twist (HT) approach to the medium-modified fragmentation functions and the next-to-leading order perturbative QCD parton model. Assuming that the jet transport parameter q is proportional to the particle number density in both quark gluon plasma (QGP) and hadronic phase, experimental data on jet quenching in deeply inelastic scattering off nuclear targets can provide guidance on q{sub h} in the hot hadronic matter. One can then study the dependence of the extracted initial value of jet-quenching parameter q{sub 0} at initial time tau{sub 0} on the bulk medium evolution. Effects of transverse expansion, radial flow, phase transition, and nonequilibrium evolution are examined. The extracted values are found to vary from q{sub 0}tau{sub 0}=0.54 GeV{sup 2} in the (1+3)d ideal hydrodynamic model to 0.96 GeV{sup 2} in a cascade model, with the main differences coming from the initial nonequilibrium evolution and the later hadronic evolution. The overall contribution to jet quenching from the hadronic phase, about 22%-44%, is found to be significant. Therefore, a realistic description of the early nonequilibrium parton evolution and later hadronic interaction will be critical for accurate extraction of the jet transport parameter in the strongly interacting QGP phase in high-energy heavy-ion collisions.

• OSTI ID: 21388626
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 81, Issue 6; Other Information: DOI: 10.1103/PhysRevC.81.064908; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BNL
BREMSSTRAHLUNG
BROOKHAVEN RHIC
DEEP INELASTIC SCATTERING
DENSITY
EXPANSION
EXTRACTION
GLUONS
HADRONS
HEAVY ION REACTIONS
HYDRODYNAMIC MODEL
MODIFICATIONS
NUCLEAR FRAGMENTATION
PHASE TRANSFORMATIONS
QUANTUM CHROMODYNAMICS
QUARK MATTER
QUENCHING
SPACE-TIME
SPECTRA
TRANSVERSE MOMENTUM
ACCELERATORS
BOSONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FIELD THEORIES
HEAVY ION ACCELERATORS
INELASTIC SCATTERING
INTERACTIONS
LEPTON-BARYON INTERACTIONS
LEPTON-HADRON INTERACTIONS
LEPTON-NUCLEON INTERACTIONS
LINEAR MOMENTUM
MATHEMATICAL MODELS
MATTER
NATIONAL ORGANIZATIONS
NUCLEAR REACTIONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PHYSICAL PROPERTIES
QUANTUM FIELD THEORY
RADIATIONS
SCATTERING
SEPARATION PROCESSES
STATISTICAL MODELS
STORAGE RINGS
THERMODYNAMIC MODEL
US AEC
US DOE
US ERDA
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