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Gösta Gustafson. Photo.

Gösta Gustafson

Post retirement professor

Gösta Gustafson. Photo.

Multiple Interactions and Saturation in High Energy Collisions


  • Gösta Gustafson


  • Yu. L. Dokshitzer
  • P. Lévai
  • J. Nyíri

Summary, in English

Energy conservation is a large part of the NLO corrections to BFKL. A formalism is presented which includes effects of energy-momentum conservation in the dipole formalism in transverse coordinate space. Energy conservation gives a very strong suppression at small x, which implies that the effect of multi-pomeron exchange and saturation are pushed to very small x-values or very high energies. Perturbative QCD and PDFs from HERA can describe jets and Et-flow in high energy pp collisions, but the multiplicity distributions are much more sensitive to non-perturbative effects. Analyses of minimum bias and underlying events show that colours appear to combine to give strings which are as short as possible, in a way very different from e+e- annihilation. This leads to important questions about the properties of the pomeron, the relation between high multiplicity events and diffraction, and the applicability of the AGK cutting rules.

Publishing year







[Host publication title missing]

Document type

Conference paper


World Scientific Publishing


  • Subatomic Physics

Conference name

Memorial Workshop Devoted to the 75th Birthday of V N Gribov

Conference date

2005-05-22 - 2005-05-24




  • ISBN: 981-256-756-9