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Measurement of J/psi photoproduction at large momentum transfer at HERA

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arxiv 0910.1235 v2 pith:AFBSY62D submitted 2009-10-07 hep-ex

ZEUS Collaboration This is my paper · ORCID
classification hep-ex
keywords heraphotoproductiontransferbeencalculationscentre-of-masscollisionscompared
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The proton-dissociative diffractive photoproduction of J/psi mesons has been studied in ep collisions with the ZEUS detector at HERA using an integrated luminosity of 112 pb^-1. The cross section is presented as a function of the photon-proton centre-of-mass energy and of the squared four-momentum transfer at the proton vertex. The results are compared to perturbative QCD calculations.

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  1. Precise Determination of the Proton's Gluon Cloud Geometry from HERA data

    hep-ph 2026-07 conditional novelty 6.0 of 10

    A global fit to all 104 HERA exclusive J/ψ data points resolves the proton's small-x gluon hotspots into a 0.105 fm Gaussian core plus a 0.22 fm exponential halo.

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