Article

Production of omega mesons in p+p, d+Au, Cu+Cu, and Au+Au collisions at sqrt(s_NN)=200 GeV

05/2011;
Source: arXiv

ABSTRACT

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.

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