Leading Particle Effect in the $J/Ψ$ Elasticity Distribution

Details Leading Particle Effect in the $J/Ψ$ Elasticity Distribution Leading Particle Effect in the $J/Ψ$ Elasticity Distribution

1998-03-12

arxiv.org/abs/hep-ph/9803325v1

Braz.J.Phys.28:505,1998

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

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.

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