Screening Corrections in Photo and DIS Production of $J/\Psi$

Abstract

Photo and DIS production of $J/\Psi$ are investigated and compared with calculations based on pQCD in the LLA approximation without and with screening corrections. The calculation includes corrections induced by the real part of the production amplitude, the skewed (off diagonal) gluon structure function and the relativistic Fermi motion within the charmonium system. Our pQCD results are also compared with the predictions obtained from a Regge type two Pomeron model. Our results suggest some preference for our screened model, but the available data does not enable us to exclude any of the three models we have examined. The properties of these models, when extrapolated to both low and very high energies may provide a more effective discrimination between the different parameterizations.

arXiv comment10 pages, 5 figures in eps files

References in corpus (19)

• Global QCD Analysis of Parton Structure of the Nucleon: CTEQ5 Parton Distributions
• Diffractive Leptoproduction of Vector Mesons in QCD
• Off-diagonal distributions fixed by diagonal partons at small $x$ and $\xi$
• Small x: Two Pomerons!
• Elastic Photoproduction of J/psi and Upsilon Mesons at HERA
• Hard diffractive electroproduction of vector mesons in QCD
• Diffractive Heavy Quarkonium Photo- and Electroproduction in QCD
• Q^2 dependence of diffractive vector meson electroproduction
• The QCD description of diffractive rho meson electroproduction
• Measurement of diffractive photoproduction of vector mesons at large momentum transfer at HERA
• Charm production at HERA
• Diffractive Photoproduction of ${\rm Y}$ at HERA
• Upsilon photoproduction at HERA compared to estimates of perturbative QCD
• The $F_2$ slope and shadowing corrections in DIS
• The effect of screening on the $x$ and $Q^2$ bhaviour of $F_2$ slopes
• Shadowing Corrections in Diffractive QCD Leptoproduction of Vector Mesons
• Study of Nondiagonal Parton Distribution Models
• Behaviour of the forward peak in hard diffractive leptoproduction of vector mesons
• Diffractive electroproduction of rho meson excitations

Cited by in corpus (11)

• Generalized Parton Distributions
• Exclusive diffractive processes at HERA within the dipole picture
• Exclusive photoproduction of a heavy vector meson in QCD
• Signatures of the Color Glass Condensate in J/Psi production off nuclear targets
• Momentum Transfer Dependence of the Differential Cross Section for $J/\psi$ Production
• Has HERA reached a new QCD regime?
• Nonperturbative and Perturbative Aspects of Photo- and Electroproduction of Vector Mesons
• Nonperturbative and perturbative aspects of photo- and electroproduction of vector mesons
• Elastic meson production and Compton scattering
• Universality in the Electroproduction of Vector Mesons
• High density QCD at THERA