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

Details A look at the influence of the $J/ψ$ transverse momentum on shadowing A look at the influence of the $J/ψ$ transverse momentum on shadowing

2008-06-23

arxiv.org/abs/0806.3678v1

AIPConf.Proc.1038:63-72,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Proceedings prepared for the HLPW08 conference (Three days of strong interactions and astrophysics, March 2008, Belgium) and w

Scientific paper

10.1063/1.2987188

Stringent physical constraints relate the $J/\psi$ 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 $J/\psi$ production. Using the $J/\psi$ rapidity and $p_T$ spectra extracted from $\sqrt{s}=200\mathrm{GeV}$ 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 $J/\psi$ nuclear modification factor as a function of $p_T$, and compare them to the available data by adding some nuclear absorption effect.

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