Abstract
The suppression of J/T) production in high energy nuclear collisions is predicted to be a signal of quark-gluon-plasma (QGP) f ormation [l]. The NA38 collaboration has collected data of the J/+ and $’ suppression in several proton-nucleus and nucleus-nucleus collisions. These data show that the J/$ meson is suppressed, in nuclear collisions, as compared to the reference process of Drell-Yan (DY) pair production. In p-A and A-B collisions, up to central S-U, the trend of J/$ suppression is very regular and is currently interpreted as the absorption, in nuclear matter, of its pre-resonant state [2]. This is no longer the case in central Pb-Pb collisions, measured by the NA50 collaboration [3], where one observes the abrupt onset of a much stronger suppression for impact parameter smaller than 8 8.5 fm. In this paper we present our interpretation of these data, with a model of deconfinement transition based on percolation theory.
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