Double Scattering Effect in Transverse Momentum Distribution of Inclusive J/ψ Production in Photo-Nucleus Collision
نویسنده
چکیده
In terms of multiple scattering picture, we calculate the double scattering effect in the transverse momentum distribution of J/ψ 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/ψ 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. PACS number(s): 12.38.-t, 12.38.Bx, 11.80.La
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