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Exclusive photoproduction of {\bf $\Upsilon$} mesons at HERA

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arxiv 0903.4205 v1 pith:UIPT4RXH submitted 2009-03-24 hep-ex

classification hep-ex
keywords exclusiveheraphotoproductionupsilonzeusanalysisbeencentre-of-mass
verification ladder T0 review T1 audit T2 compute T3 formal

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The exclusive photoproduction reaction gamma p --> Upsilon p has been studied with the ZEUS experiment in ep collisions at HERA using an integrated luminosity of 468 pb^{-1}. The measurement covers the kinematic range 60<W<220 GeV and Q^2<1 GeV^2, where W is the photon-proton centre-of-mass energy and Q^2 is the photon virtuality. These results, which represent the analysis of the full ZEUS data sample for this channel, are compared to predictions based on perturbative QCD.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Exclusive photoproduction of a di-meson pair with large invariant mass

    hep-ph 2026-05 unverdicted novelty 7.0 of 10

    Computes LO amplitudes for di-meson photoproduction channels sensitive to quark GPDs and reports high cross sections suitable for GPD studies at JLab energies.

  2. Spin resummation of heavy quarkonium photoproduction: from the gluonic gravitational form factors to the holographic pomeron

    hep-ph 2026-07 conditional novelty 6.0 of 10

    Spin-resummed holographic QCD unifies near-threshold GFF and high-energy pomeron regimes for heavy quarkonium photoproduction and shows fixed-spin GFF extraction is not controlled.

  3. Gluon Saturation Effects in Exclusive Heavy Vector Meson Photoproduction

    hep-ph 2024-11 conditional novelty 6.0 of 10

    Exclusive J/psi photoproduction off Pb targets prefers BK evolution with gluon saturation over linear BFKL evolution, and Upsilon production is predicted to distinguish them only at higher energies.

  4. Probing Quantum Phenomena through Photoproduction in Relativistic Heavy-Ion Collisions

    nucl-ex 2025-04 conditional novelty 3.0 of 10

    A review of coherent vector meson photoproduction in ultra-peripheral heavy-ion collisions, centered on two-source interference and the claim that the observed spin patterns probe quantum entanglement analogies.

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