Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1999-08-17
Nucl.Phys. A663 (2000) 1019-1022
Physics
Nuclear Physics
Nuclear Theory
4 pages, 1 table, 1 figure, Contribution to the Proceedings of the 15th Particles and Nuclei International Conference (PANIC 9
Scientific paper
10.1016/S0375-9474(99)00759-9
Last year the E866-group of the Fermilab measured the $x_F$ dependence of $J/\Psi$ and $\Psi'$ suppression in $pA$ collisions. We discuss two of the effects found in that experiment with regard to color coherence effects: the different suppression of the $J/\Psi$ and the $\Psi'$ at $x_F<0$ and the significant suppression of both at large $x_F$. The small $x_F$ regions is dominated by fully formed charmonium states and thus enables us to discuss the formation time and the cross section of the different charmonium states. In the large $x_F$ region the interaction of the charmonium states with nuclear matter has to be described by partonic degrees of freedom, because in that kinematic domain the formation time is much larger than the nuclear radii. The understanding of this region will be crucial for the interpretation of the data of the future heavy ion colliders RHIC and LHC.
Frankfurt Leonid L.
Gerland Lars
Greiner Walter
Stocker Horst
Strikman Mark
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