Computer Science
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phdt........26z&link_type=abstract
Thesis (PhD). COLUMBIA UNIVERSITY, Source DAI-B 59/07, p. 3527, Jan 1999, 212 pages.
Computer Science
Scientific paper
Ultrarelativistic nucleus-nucleus collisions at RHIC is studied numerically using a parton cascade code, ZPC, that I developed. In particular, cascade results and analytic predictions for ideal cases are compared to study the limit of parton cascade simulations for dense parton system at collider energy nucleus-nucleus collisions. We showed that when the independent binary collisions condition is satisfied, two particle center- of-mass collision algorithm minimizes the frame dependence, while global frame collision scheme has strong frame dependence. The cascade reproduces the equation of state and analytic free streaming solution in a box with very high precision. In the massless particle case, the cascade underestimates the collision rate. A new method involving particle partition is found to improve significantly the simulation results. Cascade also reproduces analytic predictions for light quark production in a box, while strange quark production is complicated by different time evolutions of the temperature parameters of the strangeness and gluon systems. Good results are obtained for the transverse energy production comparing to the analytic predictions and the effect of transverse expansion is found to decrease the transverse energy loss.
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