Screening corrections in DIS at low Q^2 and x
Abstract
In this investigation we present a detailed study of $\partial F_2/\partial \ln Q^2$ which is supported by a coupled analysis of $J/\Psi$ photo and DIS production. Both channels are directly proportional to $xG(x,Q^2)$, and as such serve as excellent discriminators between different approaches and models. We then show that taking GRV98NLO as input and correcting it for SC, we can reproduce the recent HERA data well. The calculation depends on one parameter $R^2=8.5GeV^{2}$ which is directly determined from the $J/\Psi$ photoproduction forward differential slope. With this input we obtain an excellent fit to the $J/\Psi$ photo and DIS production data. Our calculations made in the LLA of pQCD take into account the corrections implied by the real part of the production amplitude, off diagonal (skewed) gluon distributions and the Fermi motion of the charm quarks within the bound Charmonium system.
 Publication:

arXiv eprints
 Pub Date:
 July 2000
 arXiv:
 arXiv:hepph/0007274
 Bibcode:
 2000hep.ph....7274G
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 18 pages in latex file, 10 figures in ps files