Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-09-26
Proceedings of International Nuclear Phys. Conf.'95, Beijing, China, p. 140
Physics
High Energy Physics
High Energy Physics - Phenomenology
Based on a talk presented at International Nuclear Physics Conference '95, Beijing, China, 5 pages (Latex), 2 uuencoded ps fig
Scientific paper
The observed features of $\psi'$ to $J/\psi$ suppression in $pA$ and nucleus-nucleus collisions can be explained in terms of a two-component absorption model. For the hard component of the absorption due to the interaction of the produced $c\bar c$ systems with baryons at high relative energies, the absorption cross sections are insensitive to the radii of the $c\bar c$ systems, as described by the Additive Quark Model. For the soft component due to the low energy $c \bar c$ interactions with soft particles produced by other baryon-baryon collisions, the absorption cross sections are greater for $\psi'$ than for $J/\psi$, because the breakup threshold for $\psi'$ is much smaller than for $\psi$.
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