Space-time structure of initial parton production in ultrarelativistic heavy ion collisions
Creators
- 1. Laboratory of High Energy Physics, P. O. Box 9, SF-00014 University of Helsinki, Helsinki (Finland)
- 2. Nuclear Science Division, Mailstop 70A-3307, Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)
Description
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 √s =200 GeV, most of the partons are found to be produced within 0.5 fm/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
Additional details
Publishing Information
- Journal Title
- Physical Review. D, Particles Fields
- Journal Volume
- 49
- Journal Issue
- 3
- Journal Page Range
- p. 1284-1292.
- ISSN
- 0556-2821
- CODEN
- PRVDAQ
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 25042104
- Subject category
- S73: NUCLEAR PHYSICS AND RADIATION PHYSICS; S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; S73: NUCLEAR PHYSICS AND RADIATION PHYSICS;
- Descriptors DEI
- GOLD 197 REACTIONS; GOLD 197 TARGET; HEAVY ION REACTIONS; PARTICLE PRODUCTION; PARTONS; PERTURBATION THEORY; QUANTUM CHROMODYNAMICS; SPACE-TIME
- Descriptors DEC
- ELEMENTARY PARTICLES; FIELD THEORIES; NUCLEAR REACTIONS; POSTULATED PARTICLES; QUANTUM FIELD THEORY; TARGETS