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The PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) hasperformed systematic measurements of phi meson production in the K+K- decaychannel at midrapidity in p+p, d+Au, Cu+Cu and Au+Au collisions atsqrt(S_NN)=200 GeV. Results are presented on the phi invariant yield and thenuclear modification factor R_AA for Au+Au and Cu+Cu, and R_dA for d+Aucollisions, studied as a function of transverse momentum (1<p_T<7 GeV/c) andcentrality. In central and mid-central Au+Au collisions, the R_AA of phiexhibits a suppression relative to expectations from binary scaled p+p results.The amount of suppression is smaller than that of the neutral pion and the etameson in the intermediate p_T range (2--5 GeV/c); whereas at higher p_T thephi, pi^0, and eta show similar suppression. The baryon (protons andanti-protons) excess observed in central Au+Au collisions at intermediate p_Tis not observed for the phi meson despite the similar mass of the proton andthe phi. This suggests that the excess is linked to the number of constituentquarks rather than the hadron mass. The difference gradually disappears withdecreasing centrality and for peripheral collisions the R_AA values for bothparticles are consistent with binary scaling. Cu+Cu collisions show the sameyield and suppression as Au+Au collisions for the same number of N_part. TheR_dA of phi shows no evidence for cold nuclear effects within uncertainties.

Nuclear modification factors of phi mesons in d+Au, Cu+Cu and Au+Au collisions at sqrt(S_NN)=200 GeV