Abstract
The effects of energy loss in cold nuclear matter on J/ψ suppression in p-A collisions are studied. A simple model based on first principles and depending on a single free parameter is able to reproduce J/ψ suppression data at large x(F) and at various center-of-mass energies. These results strongly support energy loss as a dominant effect in quarkonium suppression. They also give some hint on its hadroproduction mechanism suggesting color neutralization to happen on long time scales. Predictions for J/ψ and Υ suppression in p-Pb collisions at the LHC are made.
Highlights
The spectacular results on jet production in Pb–Pb collisions at the LHC find a natural explanation in terms of parton energy loss in quark-gluon plasma
New scaling properties have been identified for the induced gluon radiation spectrum, dI/dω, of hard processes where a color charge undergoes small angle scattering through a static medium [4]
This observable allows for probing energy loss in nuclear matter, which is a well-controlled medium as opposed to an expanding quark-gluon plasma which dynamics is more complex
Summary
The spectacular results on jet production in Pb–Pb collisions at the LHC (see e.g. [1, 2]) find a natural explanation in terms of parton energy loss in quark-gluon plasma. The effects of energy loss in cold nuclear matter on J/ψ suppression in p–A collisions are studied. A simple model based on first principles and depending on a single free parameter is able to reproduce J/ψ suppression data at large xF and at various center-of-mass energies.
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