A New 5 Flavour NLO Analysis and Parametrizations of Parton Distributions of the Real Photon
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 Q2>1 GeV2, to all the available structure function F2gamma(x,Q2) data. As in our previous LO analysis we utilize two theoretical approaches. Two models, denoted as FFNSCJK1 & 2 NLO, adopt the so-called Fixed Flavour-Number Scheme for calculation of the heavy-quark contributions to F2gamma(x,Q2), 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 Q2 dependence of the F2gamma, averaged over various x-regions, and the F2,cgamma. Grid parametrizations of the parton densities for all fits are provided.
Turn this paper into a full lesson
ArcXiv compiles a staged curriculum from this paper: 8-12 lessons across beginner → advanced, synthesised section guides, visuals, flashcards, a quiz, exercises, and on-demand deep dives per section. Grounded in the abstract, never invented.