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A Study of the Impact of the Nuclear Modification of the Gluon Densities on J/Psi production in pPb collisions at sqrt(s_NN) = 5 TeV

Abstract : We update our previous studies of nuclear-matter effects on J/Psi production in proton-nucleus for the recent LHC pPb runs at sqrt(s_NN)=5 TeV. We have analysed the effects of the modification of the gluon PDFs in nucleus, using an exact kinematics for a 2->2 process, namely g+g->J/Psi+g as expected from LO pQCD. This allows to constrain the transverse-momentum while computing the nuclear modification factor for different rapidities, unlike with the usual simplified kinematics. Owing to the absence of measurement in pp collisions at the same sqrt(s_NN) and owing to the expected significant uncertainties in yield interpolations which would hinder definite interpretations of nuclear modification factor --R_pPb--, we have derived forward-to-backward yield ratios in which the unknown proton-proton yield cancel. These have been computed without and with a transverse-momentum cut, e.g. to comply with the ATLAS and CMS constraints in the central-rapidity region.
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http://hal.in2p3.fr/in2p3-00827435
Contributor : Sophie Heurteau <>
Submitted on : Wednesday, May 29, 2013 - 11:14:33 AM
Last modification on : Wednesday, September 16, 2020 - 4:07:56 PM

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E. G. Ferreiro, F. Fleuret, J. P. Lansberg, A. Rakotozafindrabe. A Study of the Impact of the Nuclear Modification of the Gluon Densities on J/Psi production in pPb collisions at sqrt(s_NN) = 5 TeV. Physical Review C, American Physical Society, 2013, 88 (4), pp.047901. ⟨10.1103/PhysRevC.88.047901⟩. ⟨in2p3-00827435⟩

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