A universal Regge pole model for all vector meson exclusive photoproduction by real and virtual photons

Abstract

A model based on a dipole Pomeron framework for vector meson exclusive photoproduction by real and virtual photons shows very good agreement with the experimental data. The model does not violate unitarity constrains and describes in a universal manner all the available data for ρ, ω, ϕ, J/ψ and Υ vector meson photoproduction in the region of energies 1.7 ≤ W ≤ 250 GeV and photon virtualities 0 ≤ Q 2 ≤ 35 GeV 2 .

DiffractiveJ/ψphotoproduction in a dual model

“…[14,15,17,23], and those of DAMA were studied in [24,25]. It should be noted however that at high Q 2 VMD may not be valid anymore.…”

“…[16] as well as in Regge-pole models [14,15,17] fitting high-energy J= photoproduction and electroproduction. The behavior of these trajectories has much in common at small jtj (below, say, 2 GeV 2 ), whereafter they may strongly deviate.…”

“…Alternatively, in a dipole Pomeron model [14,15,17] cross sections rise with energy logarithmically. In other words, various versions and fits of Regge-type models give different Pomeron trajectories, as shown in Fig.…”

Nuclear exclusive vector meson photoproduction

“…Taking into account the features discussed above, the differential elastic cross section is written as [28] …”

“…For meson production on proton target, our starting point is the recent work of Ref. [28], where exclusive photoproduction by real and virtual photons is described with good agreement. The extension to nuclei is provided by the assumption of vector meson dominance and the Glauber-Gribov formalism.…”