# J-psi Production and Nuclear Effects for d Au and p p Collisions at sqrts NN = 200 GeV

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J-psi production in d+Au and p+p collisions at sqrts NN = 200 GeV has been measured by the PHENIX experiment at rapidities -2.2 y +2.4. The cross sections and nuclear dependence of J-\psi production versus rapidity, transverse momentum, and centrality are obtained and compared to lower energy p+A results and to theoretical models. The observed nuclear dependence in d+Au collisions is found to be modest, suggesting that the absorption in the final state is weak and the shadowing of the gluon distributions is small and consistent with Dokshitzer-Gribov-Lipatov-Altarelli-Parisi-based parameterizations that fit deep-inelastic scattering and Drell-Yan data at lower energies.

Autor: PHENIX Collaboration; S. S. Adler

Fuente: https://archive.org/