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High-energy heavy-ion collisions are a powerful tool in the laboratory to investigate the phase transition from ordinary nuclear matter to a deconfined state of quarks and gluons, called the Quark-Gluon Plasma (QGP), which is predicted to be formed above a temperature of order Tc ~ 170 MeV in lattice Quantum Chromodynamics (QCD). Suppression of J/Ï production has long been considered to be one of the most promising signatures for the deconfinement of matter. J/Ï production has been measured by the PHENIX experiment, one of the two major experiments at the Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory (BNL) in p + p, d + Au, Au + Au and Cu + Cu collisions at the center of mass energy per nucleon (âsNN) of 200 GeV. The analysis of the Cu + Cu data is the focus of this dissertation. Yields of J/Psi production in Cu + Cu collisions at âsNN = 200 GeV have been measured by the PHENIX experiment over the rapidity range |y|
