Disentangling Shadowing from Coherent Energy Loss using the Drell-Yan Process

Abstract

We suggest the measurement of Drell-Yan (DY) lepton pairs in p-Pb collisions at the LHC (sqrt(s)=5.02 TeV) in order to disentangle the relative contributions of shadowing and coherent energy loss in quarkonium production off nuclei. The nuclear modification of low mass DY production is computed at NLO using various sets of nuclear parton densities. It is then observed that shadowing effects strongly cancel out in the J/psi over DY suppression ratio R_{pA}^{J/psi}(y) / R_{pA}^{DY}(y), unlike the effect of coherent energy loss. Such a measurement could be performed at forward rapidity by the ALICE and LHCb collaborations at the LHC.

5 pages, 3 figures

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• Predictions for Cold Nuclear Matter Effects in $p+$Pb Collisions at $\sqrt{s_{{}_{NN}}}=8.16$ TeV
• Initial-state energy loss in cold QCD matter and the Drell-Yan process
• Prospects for quarkonium studies at the high-luminosity LHC
• Status of nuclear PDFs after the first LHC p-Pb run
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• Medium-induced gluon radiation in hard forward parton scattering in the saturation formalism
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• Forward rapidity isolated photon production in proton-nucleus collisions