Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-07-30
Phys.Rev. C59 (1999) 2744-2752
Physics
High Energy Physics
High Energy Physics - Phenomenology
corrected some typos, improved shadowing ratios
Scientific paper
10.1103/PhysRevC.59.2744
The extend to which geometrical effects contribute to the production and suppression of the $J/\psi$ and $q\bar{q}$ minijet pairs in general is investigated for high energy heavy ion collisions at SPS, RHIC and LHC energies. For the energy range under investigation, the geometrical effects referred to are shadowing and anti-shadowing, respectively. Due to those effects, the parton distributions in nuclei deviate from the naive extrapolation from the free nucleon result; $f_{A}\neq A f_{N}$. The strength of the shadowing/anti-shadowing effect increases with the mass number. The consequences of gluonic shadowing effects for the $x_F$ distribution of $J/\psi$'s at $\sqrt s =20$ GeV, $\sqrt s =200$ GeV and $\sqrt s =6$ TeV are calculated for some relevant combinations of nuclei, as well as the $p_T$ distribution of minijets at midrapidity for $N_f=4$ in the final state.
Gerland Lars
Greiner Walter
Hammon Nils
Stocker Horst
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