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Exclusive vector mesons at high energies: from photon-proton to proton-proton and nucleus-nucleus collisions

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Figure

Fig. 1. A typical Feynman diagram for the γp → V p amplitude. The γ → Q Q¯ vertex is calculated perturbatively.Nonperturbative information is contained in the light cone wave function of the vector meson and the unintegratedgluon distribution.
Fig. 2. Left panel: the total cross section for γp → J/ψp. Data from the ZEUS collaboration
Fig. 3. Total cross sections for the production of light vector mesons. Left panel:ent curves show the variation with a change of the constituent quark mass [9]
Fig. 4. Rapidity dependence of central exclusive vector meson production in proton-(anti)proton collisions
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