Energy loss in a partonic transport model including bremsstrahlung processes

Journal Article · Sun Aug 15 04:00:00 EDT 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.024907· OSTI ID:21419451

Fochler, Oliver; Greiner, Carsten ^[1]; Zhe, Xu ^[1]

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1. Institut fuer Theoretische Physik, Goethe-Universitaet Frankfurt am Main, Max-von-Laue-Strasse 1, D-60438 Frankfurt am Main (Germany)

A detailed investigation of the energy loss of gluons that traverse a thermal gluonic medium simulated within the perturbative QCD-based transport model BAMPS (a Boltzmann approach to multiparton scatterings) is presented in the first part of this work. For simplicity the medium response is neglected in these calculations. The energy loss from purely elastic interactions is compared with the case where radiative processes are consistently included based on the matrix element by Gunion and Bertsch. From this comparison, gluon multiplication processes gg{yields}ggg are found to be the dominant source of energy loss within the approach employed here. The consequences for the quenching of gluons with high transverse momentum in fully dynamic simulations of Au+Au collisions at the BNL Relativistic Heavy Ion Collider (RHIC) energy of {radical}(s)=200A GeV are discussed in the second major part of this work. The results for central collisions as discussed in a previous publication are revisited, and first results on the nuclear modification factor R{sub AA} for noncentral Au+Au collisions are presented. They show a decreased quenching compared to central collisions while retaining the same shape. The investigation of the elliptic flow v{sub 2} is extended up to nonthermal transverse momenta of 10 GeV, exhibiting a maximum v{sub 2} at roughly 4 to 5 GeV and a subsequent decrease. Finally the sensitivity of the aforementioned results on the specific implementation of the effective modeling of the Landau-Pomeranchuk-Migdal (LPM) effect via a formation-time-based cutoff is explored.

• OSTI ID: 21419451
• Journal Information: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 2 Vol. 82; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ATOM COLLISIONS
ATOM-ATOM COLLISIONS
BNL
BOLTZMANN STATISTICS
BREMSSTRAHLUNG
BROOKHAVEN RHIC
COLLISIONS
COMPARATIVE EVALUATIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LOSSES
ENERGY RANGE
EVALUATION
FIELD THEORIES
GEV RANGE
GOLD
HEAVY ION ACCELERATORS
INTERACTIONS
LINEAR MOMENTUM
LOSSES
MATRIX ELEMENTS
METALS
NATIONAL ORGANIZATIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUENCHING
RADIATIONS
SCATTERING
SIMULATION
STORAGE RINGS
TRANSITION ELEMENTS
TRANSPORT THEORY
TRANSVERSE MOMENTUM
US AEC
US DOE
US ERDA
US ORGANIZATIONS