
TL;DR
This paper investigates the nuclear effects influencing J/Psi production in proton-nucleus and nucleus-nucleus collisions, emphasizing coherence, color transparency, and shadowing effects, and how these phenomena impact observed suppression patterns.
Contribution
It introduces a comprehensive model explaining J/Psi suppression and enhancement phenomena without adjustable parameters, highlighting the roles of coherence, color filtering, and shadowing effects.
Findings
Effective break-up cross section depends on energy and nuclear path length.
Coherence effects lead to charm quark shadowing at high energies.
Double color filtering significantly increases nuclear transparency in AA collisions.
Abstract
Nuclear effects for J/Psi production in pA collisions are controlled by the coherence and color transparency effects. Color transparency onsets when the time of formation of the charmonium wave function becomes longer than the inter-nucleon spacing. In this energy regime the effective break-up cross section for a c-cbar dipole depends on energy and nuclear path length, and agrees well with data from fixed target experiments, both in magnitude and energy dependence. At higher energies of RHIC and LHC coherence in c-cbar pair production leads to charm quark shadowing which is a complement to the high twist break up cross section. These two effects explain well with no adjusted parameters the magnitude and rapidity dependence of nuclear suppression of J/Psi observed at RHIC in dAu collisions, while the contribution of leading twist gluon shadowing is found to be vanishingly small. A novel…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
