Space-time Structure of Initial Parton Production in Ultrarelativistic Heavy Ion Collisions

Details Space-time Structure of Initial Parton Production in Ultrarelativistic Heavy Ion Collisions Space-time Structure of Initial Parton Production in Ultrarelativistic Heavy Ion Collisions

1993-07-12

arxiv.org/abs/nucl-th/9307011v1

Phys.Rev. D49 (1994) 1284-1292

Physics

Nuclear Physics

Nuclear Theory

19 pages in REVTEX with 12 figures in separate uuencoded postscript files, LBL-34156

Scientific paper

10.1103/PhysRevD.49.1284

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. Uncertainty principle is used to relate the life time 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 $\sqrt{s}=200$ 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 isotropical at that time. The implication on how to treat correctly the the secondary scattering in an ultimate parton cascading model is also discussed.

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