Color Evaporation and Elastic ${\rm Y}$ Photoproduction at DESY HERA

Abstract

The 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 ${\rm Y}$ 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 $J/\Psi$ case, the HERA data for this process can be well described by the CEM. Moreover, we propose the analyzes of the ratio $R={\sigma }_{{\rm Y}}/{\sigma }_{J/\Psi }$ to discriminate between the distinct approaches.

7 pages, 3 figures, accepted for publication in PRD (Brief Reports)

References in corpus (1)

• Soft Color Interactions and Diffractive Hard Scattering at the Fermilab Tevatron

Cited by in corpus (4)

• Diffractive Vector Meson Production at HERA: from Soft to Hard QCD
• Forward Drell-Yan production at the LHC in the BFKL formalism with collinear corrections
• Diffractive quarkonium photoproduction in $pp$ and $pA$ collisions at the LHC: Predictions of the Resolved Pomeron model for the Run 2 energies
• Investigating the Transverse Single Spin Asymmetry in the Inelastic $J/\Psi$ photoproduction in $p^{\uparrow }p$ and $p^{\uparrow }A$ collisions