Charmonium Production in gamma-A, p-A and A-A
L. Gerland
Abstract
The data for the production of the ψ' meson in pA collisions at 450 GeV at CERN-SPS (of the NA50-collaboration) yields σ(ψ' N)≈ 8 mb under the assumption that the ψ' is produced as a result of the space-time evolution of a point-like c c pair which expands with time to the full size of the charmonium state. However, much higher values of σ(ψ' N) are not ruled out by the data. We show that recent CERN data confirm the suggestion that color fluctuations are the major source of suppression of the J/ψ yield as observed at CERN in both pA and AA collisions.
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