1998/11/24 by J. Chýla, Jiri Chyla, Chyla, Jiri
Mathematics · Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #advanced mathematical theories #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9811455
20 pages, Latex, 5 figures in EPS format attached
openalex publication_date 1998/11/24 · arxiv created 1999/04/12 · arxiv updated 2009/11/30 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28
Factorization scheme analysis of F2γ(x,Q2) in the next-to-leading order QCD is revisited. It is emphasized that the presence of the inhomogeneous term in the evolution equations for quark distribution functions of the photon implies subtle but important difference in the way factorization mechanism works in photon-hadron and photon-photon collisions as compared to the hadronic ones. It is argued that none of the existing NLO analyses of F2γ(x,Q2) takes this difference properly into account. The source of the ensuing incompleteness is traced back to the misinterpretation of the behaviour of qγ(x,M) as a function of αs(M). Parton model interpretation of the so called ``constant terms'' in the LO photonic coefficient function Cγ(0)(x) is given and smooth transition between the properties of virtual and real photon analyzed. Finally phenomenological consequences of this analysis are discussed.