KNO scaling from a nearly Gaussian action for small-x gluons

Adrian Dumitru, Elena Petreska

Research output: Contribution to JournalArticleAcademicpeer-review


Transverse momentum integrated multiplicities in the central region of pp collisions at LHC energies satisfy Koba-Nielsen-Olesen scaling. We attempt to relate this finding to multiplicity distributions of soft gluons. KNO scaling emerges if the effective theory describing color charge fluctuations at a scale on the order of the saturation momentum is approximately Gaussian. From an evolution equation for quantum corrections which includes both saturation as well as fluctuations we find that evolution with the QCD \beta-function satisfies KNO scaling while fixed-coupling evolution does not. Thus, non-linear saturation effects and running-coupling evolution are both required in order to reproduce geometric scaling of the DIS cross section and KNO scaling of virtual dipoles in a hadron wave function.
Original languageEnglish
Publication statusPublished - 18 Sept 2012

Bibliographical note

Notes based on various presentations delivered by the authors in spring/summer 2012


  • hep-ph
  • hep-ex
  • nucl-th


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