Production of omega mesons in p+p, d+Au, Cu+Cu, and Au+Au collisions at   sqrt(s_NN)=200 GeV
  The PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) has measured omega meson production via leptonic and hadronic decay channels in p+p, d+Au, Cu+Cu, and Au+Au collisions at sqrt(s_NN) = 200 GeV. The invariant transverse momentum spectra measured in different decay modes give consistent results. Measurements in the hadronic decay channel in Cu+Cu and Au+Au collisions show that omega production has a suppression pattern at high transverse momentum, similar to that of pi^0 and eta in central collisions, but no suppression is observed in peripheral collisions. The nuclear modification factors, R_AA, are consistent in Cu+Cu and Au+Au collisions at similar numbers of participant nucleons. 
A. Adare, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, H.   Al-Bataineh, A. Al-Jamel, J. Alexander, A. Angerami, K. Ao...
nucl-ex