Production of omega mesons at Large Transverse Momenta in p+p and d+Au Collisions at sqrt(sNN) = 200 GeV
Abstract
The PHENIX experiment at RHIC has measured the invariant cross section for omega-meson production at mid-rapidity in the transverse momentum range 2.5 < pT < 9.25 GeV/c in p+p and d+Au collisions at sqrt(sNN) = 200 GeV. Measurements in two decay channels (omega --> pi0 pi+ pi- and omega --> pi0 gamma) yield consistent results, and the reconstructed omega mass agrees with the accepted value within the pT range of the measurements. The omega/pi0 ratio is found to be 0.85 +/- 0.05(stat) +/- 0.09(sys) and 0.94 +/- 0.08(stat) +/- 0.12(sys) in p+p and d+Au collisions respectively, independent of pT . The nuclear modification factor RdA is 1.03 +/- 0.12(stat) +/- 0.21(sys) and 0.83 +/- 0.21(stat) +/- 0.17(sys) in minimum bias and central (0-20%) d+Au collisions, respectively.
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