jpsi Suppression and the Quark-Gluon Plasma
S. Frankel, W. Frati
Abstract
All measured Feynman xf distributions of the ratio, R, of jpsi production in nuclei relative to production on protons fall off with xf. They show [2] that absorption of charmonium cannot be the only source of jpsi suppression and that energy loss of the constituents of the incident proton prior to the jpsi production, because of the exponential sqrt(s) dependence of the charmonium cross section, should not be neglected. Including the effects of initial state energy loss we find that the latest measured Pb-Pb jpsi cross sections do not provide any evidence for deconfinement.
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