Physics of Atomic Nuclei

, Volume 64, Issue 4, pp 753–774 | Cite as

Deep-inelastic scattering in κ factorization and the anatomy of the differential gluon structure function of the proton

  • I. P. Ivanov
  • N. N. Nikolaev
90th Anniversary of A.B. Migdal's Birthday Elementary Particles and Fields

Abstract

The differential gluon structure function of the proton, ℱ(x, Q2), introduced by Fadin, Kuraev, and Lipatov in 1975 is extensively used in small-x QCD. We report here the first determination of ℱ(x, Q2) from experimental data on the small-x proton structure function F2p(x, Q2). We give convenient parametrizations for ℱ(x, Q2) based partly on the available DGLAP evolution fits (GRV, CTEQ, and MRS) to parton distribution functions and on realistic extrapolations into the soft region. We discuss the impact of soft gluons on various observables. The x dependence of the so-determined ℱ(x, Q2) varies strongly with Q2 and does not exhibit simple Regge properties. Nonetheless, the hard-to-soft diffusion is found to give rise to a viable approximation of the proton structure function F2p(x, Q2) by the soft and hard Regge components with intercepts Δsoft=0 and Δhard ∼ 0.4.

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Copyright information

© MAIK "Nauka/Interperiodica" 2001

Authors and Affiliations

  • I. P. Ivanov
    • 1
    • 2
    • 3
  • N. N. Nikolaev
    • 1
    • 4
  1. 1.Institut für Kernphysik (Theorie)Forschungszentrum JülichGermany
  2. 2.Sobolev Institute for Mathematics, Siberian DivisionRussian Academy of SciencesNovosibirskRussia
  3. 3.Novosibirsk State UniversityNovosibirskRussia
  4. 4.Landau Institute for Theoretical PhysicsRussian Academy of SciencesMoscowRussia

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