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Profile picture of Leif Lönnblad. Photo.

Leif Lönnblad

Professor of Theoretical Physics

Profile picture of Leif Lönnblad. Photo.

Diffractive Excitation in DIS and pp Collisions

Author

  • Emil Avsar
  • Gösta Gustafson
  • Leif Lönnblad

Summary, in English

We have in earlier papers presented an extension of Mueller's dipole cascade model, which includes subleading effects from energy conservation and running coupling as well as colour suppressed effects from pomeron loops via a ``dipole swing''. The model was applied to describe the total cross sections in pp and gamma*p collisions. In this paper we present a number of improvements of the model, in particular related to the confinement mechanism. A consistent treatment of dipole evolution and dipole--dipole interactions is achieved by replacing the infinite range Coulomb potential by a screened potential, which further improves the frame-independence of the model. We then apply the model to elastic scattering and diffractive excitation, where we specifically study the effects of different sources for fluctuations. In our formalism we can take into account contributions from all different sources, from the dipole cascade evolution, the dipole--dipole scattering, from the impact-parameter dependence, and from the initial photon and proton wavefunctions. Good agreement is obtained with data from the Tevatron and from HERA, and we also present some predictions for the LHC.

Department/s

  • Theoretical Particle Physics

Publishing year

2007

Language

English

Publication/Series

Journal of High Energy Physics

Volume

0712

Issue

012

Document type

Journal article

Publisher

Springer

Topic

  • Subatomic Physics

Keywords

  • Small-x physics
  • Diffraction
  • DIS.
  • Dipole Model
  • Saturation

Status

Published

ISBN/ISSN/Other

  • ISSN: 1029-8479