Space-time structure of initial parton production in ultrarelativistic heavy ion collisions
- Nuclear Science Division, Mailstop 70A-3307, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States) Laboratory of High Energy Physics, P. O. Box 9, SF-00014 University of Helsinki, Helsinki (Finland)
- Nuclear Science Division, Mailstop 70A-3307, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)
The space and time evolution of initial parton production in ultrarelativistic heavy ion collisions is investigated within the framework of perturbative QCD which includes both initial and final state radiations. The uncertainty principle is used to relate the lifetime of a radiating parton to its virtuality and momentum. The interaction time of each hard or semihard parton scattering is also taken into account. For central Au+Au collisions at [radical][ital s] =200 GeV, most of the partons are found to be produced within 0.5 fm/[ital c] after the total overlap of the two colliding nuclei. The local momentum distribution is approximately isotropic at that time. The implication on how to treat correctly the secondary scattering in an ultimate parton cascading model is also discussed.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5338875
- Journal Information:
- Physical Review, D (Particles Fields); (United States), Vol. 49:3; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
GOLD 197 TARGET
PARTICLE PRODUCTION
SPACE-TIME
PARTONS
GOLD 197 REACTIONS
HEAVY ION REACTIONS
PERTURBATION THEORY
QUANTUM CHROMODYNAMICS
CHARGED-PARTICLE REACTIONS
ELEMENTARY PARTICLES
FIELD THEORIES
NUCLEAR REACTIONS
POSTULATED PARTICLES
QUANTUM FIELD THEORY
TARGETS
663450* - Heavy-Ion-Induced Reactions & Scattering- (1992-)
662230 - Quantum Chromodynamics- (1992-)
663300 - Nuclear Reactions & Scattering
General- (1992-)