Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1998-09-08
J.Phys.G25:1123-1133,1999
Physics
Nuclear Physics
Nuclear Theory
16 pages (RevTex), 6 ps-figures, to be published in J. Phys. G
Scientific paper
10.1088/0954-3899/25/6/302
A mechanism for the effective dissociation of a $c\bar{c}$ pair in the colour electric field of strings is introduced into a hadron and string cascade model, i.e. JPCIAE, which is based on the LUND model, simulating ultra-relativistic nucleus - nucleus collisions. This new mechanism together with the known mechanism of nuclear absorption (both baryons and mesons) could reproduce fairly the data of the normal and anomalous $J/\psi$ suppressions in minimum bias pA, AB (with light projectile), and Pb + Pb collisions at 200 A GeV/c. However the impact parameter (E_T) dependence of the $J/\psi$ suppression factor, both, in S + U and Pb + Pb reactions at 200 A GeV/c and 158 A GeV/c, respectively, is not well reproduced. We also tested the additional mechanism of the energy degradation of leading particles, with which both, the normal and anomalous $J/\psi$ suppressions in minimum bias pA, AB, and Pb + Pb collisions and the E_T dependence of the $J/\psi$ suppression factor are better reproduced.
An Tai
Ben-Hao Sa
Faessler Amand
Fuchs Ch.
Hui Wang
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