Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2001-03-09
Phys.Rev. C64 (2001) 054611
Physics
Nuclear Physics
Nuclear Theory
14 pages (LaTeX) + 15 figures (eps), submitted to Phys. Rev. C
Scientific paper
10.1103/PhysRevC.64.054611
The enhanced suppression of $J/\psi$ production at large $x_F$ in $pA$ collisions is studied in the framework of gluon depletion at large $x_1$. The nonperturbative process that modifies the gluon distribution as the gluons propagate in nuclear matter is described by an evolution equation with a kernal to be determined by phenomenology. With nuclear shadowing and anti-shadowing taken into account, the effect on the gluon distribution is shown to be a depletion in excess of 40% at $x_1 \approx 0.8$ for $A > 100$. There is a small amount of enhancement of the gluon distribution at small $x_1$, but it does not lead to any contradiction with the existing data on $J/\psi$ suppression in the central region. Extentions to $\psi^{\prime}$ suppression and $AB$ collisions are also investigated in the framework of gluon redistribution.
Hwa Rudolph C.
Pisut Jan
Pisutova Neva
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