A look at the influence of the J∕ψ transverse momentum on shadowing

Abstract

Abstract.Stringent physical constraints relate the J/ψ produced at a given transverse momentum p T to the Bjorken-x of the initial gluons. We present a new approach which takes them into account in order to explicitely investigate the p T -dependence of the shadowing effect on the J/ψ production. Using the J/ψ rapidity and p T spectra extracted from √ s = 200 GeV p + p data from PHENIX, we build a Glauber Monte-Carlo code which includes shadowing in two alternative ways: multiple scattering corrections or Q 2 evolution of parton densities. We present our results in d + Au collisions at the same energy, notably providing the first prediction of the J/ψ nuclear modification factor as a function of p T , and compare them to the available data by adding some nuclear absorption effect.