Abstract
The effect of parton energy loss in cold nuclear matter on the suppression of quarkonia (J/ψ, ϒ) in heavy-ion collisions is investigated, by extrapolating a model based on coherent radiative energy loss recently shown to describe successfully J/ψ and ϒ suppression in proton-nucleus collisions. Model predictions in heavy-ion collisions at RHIC (Au-Au, Cu-Cu, and Cu-Au) and LHC (Pb-Pb) show a sizable suppression arising from the sole effect of energy loss in cold matter. This effect should thus be considered in order to get a reliable baseline for cold nuclear matter effects in quarkonium suppression in heavy-ion collisions, in view of disentangling hot from cold nuclear effects.
Highlights
What is more, predictions in p-Pb collisions at the LHC proved in excellent agreement with ALICE [8] and LHCb [9] data
At RHIC energy, coherent energy loss leads to a sizable J/ψ suppression, with a rather flat dependence both in rapidity and in centrality, for instance RAuAu 0.7 − 0.8 in a broad centrality and rapidity domain
J/ψ suppression observed at RHIC, while excellent agreement is reached in d-Au collisions [6]
Summary
We briefly remind the basics of the model based on coherent energy loss used to describe ψ suppression measured in proton-nucleus collisions. The upper limit on the energy loss is εmax = min (EB, Ep − EB), where Ep is the beam energy in that frame, and the p-p production cross section is given by a fit to data. In view of generalizing the model to A-B collisions, where the projectile and target play symmetric roles, it is convenient to change variable from EB to the (proton-nucleon) c.m. frame rapidity y, using. The expression (2.6), together with the explicit form of Pgiven in appendix A (see (A.5)), was used in [6, 7] to study ψ nuclear suppression in proton-nucleus collisions
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