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A New 5 Flavour NLO Analysis and Parametrizations of Parton Distributions of the Real Photon

Authors
  • Cornet, F.
  • Jankowski, P.
  • Krawczyk, M.
Type
Published Article
Publication Date
Apr 07, 2004
Submission Date
Apr 07, 2004
Identifiers
DOI: 10.1103/PhysRevD.70.093004
Source
arXiv
License
Unknown
External links

Abstract

New, radiatively generated, NLO quark (u,d,s,c,b) and gluon densities in a real, unpolarized photon are presented. We perform three global fits, based on the NLO DGLAP evolution equations for Q^2>1 GeV^2, to all the available structure function F_2^gamma(x,Q^2) data. As in our previous LO analysis we utilize two theoretical approaches. Two models, denoted as FFNS_{CJK}1 & 2 NLO, adopt the so-called Fixed Flavour-Number Scheme for calculation of the heavy-quark contributions to F_2^gamma(x,Q^2), the CJK NLO model applies the ACOT(chi) scheme. We examine the results of our fits by a comparison with the LEP data for the Q^2 dependence of the F_2^gamma, averaged over various x-regions, and the F_2,c^gamma. Grid parametrizations of the parton densities for all fits are provided.

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