Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-11-10
Nucl.Phys. B541 (1999) 267-286
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages LaTex (9 figures included), to appear in Nucl. Phys. B
Scientific paper
10.1016/S0550-3213(98)00768-8
In terms of multiple scattering picture, we calculate the double scattering effect in the transverse momentum distribution of $J/\psi$ photoproduction. Applying the generalized factorization theorem, we find that the contributions from double scattering can be expressed in terms of twist-4 nuclear parton correlation functions, which is the same as that used to explain the nuclear dependence in di-jet momentum imbalance and in direct photon production. Using the known information on the twist-4 parton correlation functions, we estimate that the double scattering contributes a small suppression in $J/\psi$ photoproduction. In the analysis we only take into account the leading order in the small velocity expansion for the nonperturbative parts related to the quarkonium.
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