Leading Particle Effect in the $J/\Psi$ Elasticity Distribution

Abstract

Recent DESY-HERA data on $J/\Psi$ elasticity distribution show that it emerges mostly as a fast particle. Interpreting photoproduction as a collision between a pre-formed charmed hadron and the proton, the outcoming $J/\Psi$ is a leading particle of the collision. We analyse these data using a model formulated to describe energy flow in hadron-hadron reactions. The measured $J/\Psi$ spectrum can be successfully described in terms of this model. We conclude that the observed transparency of the charmed hadron-proton collisions arises because of the particularly small gluonic content of the initial $c-\bar{c}$ state.

4 pages, Latex, 2 ps figures. Submitted to Phys. Lett. B