Date of Award


Degree Type


Degree Name

Doctor of Philosophy (PhD)


Physics and Astronomy

First Advisor

Dr. Xiaochun He - Chair

Second Advisor

Dr. Nikolaus Dietz

Third Advisor

Dr. Steven Manson

Fourth Advisor

Dr. Richard Miller

Fifth Advisor

Dr. A. G. Unil Perera

Sixth Advisor

Dr. Murad Sarsour


With the use of an incoherent binary nucleon-nucleon collision model of heavy ion collisions for simulating particle production, it is demonstrated that the nuclear modification factors, R_{AA} and R_{CP}, are less than unity for hard scattering in the absence of any nuclear modification effects. The nuclear modification factor R_{dAu} is also shown to approach or exceed unity only if p_T broadening is taken into account. With a simple phenomenological parameter, the mean nucleon energy loss fraction, this model yields particle distributions that are comparable to those of experiment. The nuclear geometry is described by the Glauber model, and particle production is simulated by the PYTHIA event generator.