Charmonium suppression from purely geometrical effects

Details Charmonium suppression from purely geometrical effects Charmonium suppression from purely geometrical effects

1998-07-30

arxiv.org/abs/hep-ph/9807546v2

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.

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