Abstract
The exclusive production of vector mesons and photons in $ep$ collisions is investigated considering three phenomenological saturation models based on distinct assumptions for the treatment of the dipole-hadron scattering amplitude. The latest high precision HERA data for the reduced and vector meson cross sections are used to update the saturation model proposed by Marquet Peschanski, and Soyez, which predicts that the saturation scale is dependent of the squared momentum transfer $t$. The Marquet-Peschanski-Soyez predictions for the photon virtuality, energy and $t$ dependencies of the exclusive $\ensuremath{\rho}$, $J/\mathrm{\ensuremath{\Psi}}$, and deeply virtual Compton scattering cross sections are presented and a detailed comparison with the results derived using the impact parameter saturation models is performed. Our results indicate that a future experimental analysis of the $t$ distribution $d\ensuremath{\sigma}/dt$ for exclusive processes in the kinematical range that will covered by the EIC and LHeC, considering the distinct photon polarizations and large values of $t$, will be able to discriminate between the distinct approaches for the QCD dynamics at high energies.
Highlights
The main goal of the future Electron-Ion Colliders at the BNL (EIC) [1] and at the LHC (LHeC) [2] is to achieve a deeper knowledge of the hadronic structure at high energies through the deep inelastic scattering process, where an electron emits a virtual photon that interacts with a proton/nuclear target
Our results indicate that a future experimental analysis of the t distribution dσ=dt for exclusive processes in the kinematical range that will covered by the EIC and LHeC, considering the distinct photon polarizations and large values of t, will be able to discriminate between the distinct approaches for the QCD dynamics at high energies
Several studies have shown that the exclusive production of vector mesons and photons in ep collisions have the potential to probe the QCD dynamics at high energies
Summary
The main goal of the future Electron-Ion Colliders at the BNL (EIC) [1] and at the LHC (LHeC) [2] is to achieve a deeper knowledge of the hadronic structure at high energies through the deep inelastic scattering process, where an electron emits a virtual photon that interacts with a proton/nuclear target. The proton structure can be studied through the γÃp interaction, with the behavior of the observables being determined by the QCD dynamics at high energies. At high energies, a hadron becomes a dense system and the nonlinear (saturation) effects inherent to the QCD dynamics may become visible [4].
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