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Determining the Proton's Gluon Cloud Geometry from HERA Data
The transverse shape of the proton's small-$x$ gluon distribution is determined from exclusive $J/ψ$ photoproduction at HERA. We derive analytic expressions for the coherent and incoherent diffractive cross sections in the hotspot model at leading twist, enabling a global fit to all 104 available H1
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