Color Evaporation and Elastic $Υ$ Photoproduction at DESY HERA

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dc.creatorDucati, M. B. Gay
dc.creatorGoncalves, V. P.
dc.creatorMariotto, C. B.
dc.date2001-10-31
dc.date.accessioned2026-07-07T10:32:56Z
dc.date.available2026-07-07T10:32:56Z
dc.descriptionThe diffractive photoproduction of vector mesons is usually described considering the two-gluon (Pomeron) exchange, non-diagonal parton distributions and the contribution of the real part to the cross section. In this letter we analyze the diffractive photoproduction of the $Υ$ at HERA using an alternative model, the Color Evaporation Model (CEM), where the cross section is simply determined by the boson-gluon cross section and an assumption for the production of the colorless state. We verify that, similarly to the $J/Ψ$ case, the HERA data for this process can be well described by the CEM. Moreover, we propose the analyzes of the ratio $R = σ_Υ / σ_{J/Ψ}$ to discriminate between the distinct approaches.
dc.description7 pages, 3 figures, accepted for publication in PRD (Brief Reports)
dc.identifierhttps://arxiv.org/abs/hep-ph/0110404
dc.identifierhttp://arxiv.org/abs/hep-ph/0110404
dc.identifierPhys.Rev.D65:037503,2002
dc.identifierdoi:10.1103/PhysRevD.65.037503
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178934
dc.subjectHigh Energy Physics - Phenomenology
dc.titleColor Evaporation and Elastic $Υ$ Photoproduction at DESY HERA
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