Rescattering Effects in Quarkonium Production

Details Rescattering Effects in Quarkonium Production Rescattering Effects in Quarkonium Production

1997-06-24

arxiv.org/abs/hep-ph/9706486v2

Phys.Rev. D57 (1998) 1864-1877

Physics

High Energy Physics

High Energy Physics - Phenomenology

30 pages, Latex

Scientific paper

10.1103/PhysRevD.57.1864

We study eta_c and J/psi hadroproduction induced by multiple scattering off fixed centres in the target. We determine the minimum number of hard scatterings required and show that additional soft scatterings may be factorized, at the level of the production amplitude for the eta_c and of the cross section for the J/psi. The J/psi provides an interesting example of soft rescattering effects occurring inside a hard vertex. We also explain the qualitative difference between the transverse momentum broadening of the J/psi and of the Upsilon observed in collisions on nuclei. We point out that rescattering from spectators produced by beam and target parton evolution may have important effects in J/psi production.

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