Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-11-24
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, Latex, 5 figures in EPS format attached
Scientific paper
Factorization scheme analysis of $F_2^{\gamma}(x,Q^2)$ 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 $F_2^{\gamma}(x,Q^2)$ takes this difference properly into account. The source of the ensuing incompleteness is traced back to the misinterpretation of the behaviour of $q^{\gamma}(x,M)$ as a function of $\alpha_s(M)$. Parton model interpretation of the so called ``constant terms'' in the LO photonic coefficient function $C_{\gamma}^{(0)}(x)$ is given and smooth transition between the properties of virtual and real photon analyzed. Finally phenomenological consequences of this analysis are discussed.
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