A systematic study of J/ψ suppression in cold nuclear matter |
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| Authors: | F Arleo V-N Tram |
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| Institution: | (1) PH Department, TH Division, CERN, 1211 Geneva 23, Switzerland;(2) Laboratoire d’Annecy-le-Vieux de Physique Théorique (LAPTH), UMR 5108 du CNRS associée à l’Université de Savoie, B.P. 110, 74941 Annecy-le-Vieux Cedex, France;(3) Laboratoire Leprince-Ringuet, Ecole Polytechnique, 91128 Palaiseau Cedex, France;(4) Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA |
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| Abstract: | Understanding the effects of cold nuclear matter on J/ψ production is a key requirement for interpreting the J/ψ suppression
reported in heavy-ion collisions. Based on a Glauber model, the J/ψ–nucleon inelastic cross section is determined from a statistical
analysis of the J/ψ world data on nuclear targets. The global fit of all data gives σJ/ψN = 3.4 ± 0.2 mb, significantly smaller than previous estimates, yet the χ2 of the fit is pretty large, χ2/ndf=1.5. A similar value, σJ/ψN = 3.5 ± 0.2 ± 1.7 mb, is obtained when the De Florian–Sassot modifications of the nuclear parton densities are included in
the analysis, although we emphasise that the present uncertainties on gluon (anti-) shadowing do not allow for a precise determination
of σJ/ψN. Finally, the possible energy dependence of the J/ψ–nucleon inelastic cross section is investigated within this framework.
No significant energy dependence of the J/ψ–N interaction is observed.
PACS 25.75.-q; 14.40.Gx; 24.85.+p |
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