Centrality, Rapidity, and Transverse-Momentum Dependence of Gluon Shadowing and Antishadowing on J/ψ Production in dAu Collisions at Ös = 200s=200 GeV

E.G. Ferreiro , F. Fleuret (1) , J. P. Lansberg (2) , N. Matagne , A. Rakotozafindrabe (3)

1 LLR - Laboratoire Leprince-Ringuet
2 IPNO - Institut de Physique Nucléaire d'Orsay
3 IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers

We have carried out a wide study of shadowing and antishadowing effects on J/ψ production in dAu collisions at Ö{sN N} = 200sNN=200 GeV. We have studied the effects of three different gluon nPDF sets, using the exact kinematics for a 2 → 2 process, namely g + g → J/ψ + g as expected from LO pQCD. We have computed the rapidity dependence of R CP and R dAu for the different centrality classes of the PHENIX data. For mid rapidities, we have also computed the transverse-momentum dependence of the nuclear modification factor, which cannot be predicted with the usual 2 → 1 simplified kinematics. All these observables have been compared to the PHENIX data in dAu collisions.

Domaines: Physique Nucléaire Théorique [nucl-th]

E.G. Ferreiro, F. Fleuret, J. P. Lansberg, N. Matagne, A. Rakotozafindrabe. Centrality, Rapidity, and Transverse-Momentum Dependence of Gluon Shadowing and Antishadowing on J/ψ Production in dAu Collisions at Ös = 200s=200 GeV. Few-Body Systems, 2012, 53, pp.27-36. ⟨10.1007/s00601-012-0310-9⟩. ⟨in2p3-00723998⟩