Quarkonium suppression from coherent energy loss in fixed-target experiments using LHC beams

Understand

Quarkonium production in proton-nucleus collisions is a powerful tool to disentangle cold nuclear matter effects.

• A model based on coherent energy loss is able to explain the available quarkonium suppression data in a broad range of rapidities, from fixed-target to collider energies, suggesting cold energy loss to be the dominant effect in quarkonium suppression in p-A collisions.
• This could be further tested in a high-energy fixed-target experiment using a proton or nucleus beam.
• The nuclear modification factors of J/$\psi$ and $\Upsilon$ as a function of rapidity are computed in p-A collisions at $\sqrt{s}=114.6$ GeV, and in p-Pb and Pb-Pb collisions at $\sqrt{s}=72$ GeV.