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Gösta Gustafson. Photo.

Gösta Gustafson

Post retirement professor

Gösta Gustafson. Photo.

Geometric scaling and QCD dynamics in DIS

Author

  • Emil Avsar
  • Gösta Gustafson

Summary, in English

DIS data from HERA show a striking regularity as sigma(gamma*p) is a function of the ratio tau = Q(2)/Q(s)(2)(x) only. The scaling function shows a break at 7 t, which has been taken as an indication for saturation. However, besides saturation also the transition between dominance of k(perpendicular to)-ordered (DGLAP) and k(perpendicular to)-non-ordered (BFKL) evolution contributes to a break around this value of 7, as well as the suppression for small Q(2) due to finite quark masses and confinement. In this paper we use a dipole cascade model based on Mueller's dipole model, which also includes energy conservation and pomeron mergings, to investigate the contributions of these different effects to the scaling behaviour. As a result we predict that the scaling function for tau < 1 will be modified when data for Q(2) > 1 GeV2 become available. We also investigate the scaling properties of the charm contribution and the impact parameter dependence of the saturation scale.

Department/s

  • Theoretical Particle Physics

Publishing year

2007

Language

English

Pages

25-25

Publication/Series

Journal of High Energy Physics

Issue

4

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • PROTON STRUCTURE
  • HIGH-ENERGY
  • BFKL POMERON
  • STATISTICAL PHYSICS
  • phenomenological models
  • PICTURE
  • EVOLUTION
  • UNITARITY
  • COHERENCE
  • SCATTERING
  • SMALL-X
  • deep inelastic scattering
  • QCD

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479