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29 March 2024
 
  » arxiv » nucl-th/9809020

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$J/psi$ normal and anomalous suppressions in a hadron and string cascade model
Sa Ben-Hao ; Amand Faessler ; Tai An ; T. Waindzoch ; C. Fuchs ; Z. S. Wang ; Wang Hui ;
Date 8 Sep 1998
Journal J.Phys. G25 (1999) 1123-1133
Subject nucl-th
AbstractA mechanism for the effective dissociation of a $car{c}$ 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.
Source arXiv, nucl-th/9809020
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