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Double Scattering Effect in Transverse Momentum Distribution of Inclusive $J/ψ$ Production in Photo-Nucleus Collision

Han-Wen Huang
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Abstract

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.

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Han-Wen Huang. 1998-11-10. Double Scattering Effect in Transverse Momentum Distribution of Inclusive $J/ψ$ Production in Photo-Nucleus Collision. https://doi.org/10.1016/s0550-3213(98)00768-8

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