Eur. Phys. J. C (2009) 61: 859-864
https://doi.org/10.1140/epjc/s10052-008-0843-8

Regular Article - Theoretical Physics

Transverse-momentum dependence of J/ψ shadowing effects

¹ Departamento de Física de Partículas, Universidade de Santiago de Compostela, 15782, Santiago de Compostela, Spain
² Laboratoire Leprince Ringuet, École Polytechnique, 91128, Palaiseau, France
³ CEA, Centre de Saclay, IRFU/SPhN, 91191, Gif-sur-Yvette, France

^* e-mail: fleuret@in2p3.fr

Received: 9 September 2008
Revised: 1 December 2008
Published online: 14 January 2009

Abstract

We present a new approach to estimate the effect of gluon shadowing in nucleus + nucleus collisions and its consequences on the J/ψ production yield. Using kinematical information available from the measured J/ψ production in proton + proton collisions at  GeV, we build a Glauber Monte Carlo code which takes into account shadowing in two alternative ways: multiple-scattering corrections or Q ² evolution of parton densities. We exploit the dependence of these different parameterizations to the J/ψ transverse momentum and we give the first predictions on the resulting p _T dependence of the nuclear modification factor in deuteron + gold collisions at the same energy.