Spin-Dependent Structure Functions of Real and Virtual Photons

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dc.creatorGluck, M.
dc.creatorReya, E.
dc.creatorSieg, C.
dc.date2001-03-13
dc.date.accessioned2026-07-07T12:26:13Z
dc.date.available2026-07-07T12:26:13Z
dc.descriptionThe implications of the positivity constraint, $|g_1^{γ(P^2)}(x,Q^2)| \leq F_1^{γ(P^2)}(x,Q^2)$, on the presently unknown spin--dependent structure function $g_1^{γ(P^2)}(x,Q^2)$ of real and virtual photons are studied at scales $Q^2\gg P^2$ where longitudinally polarized photons dominate physically relevant cross sections. In particular it is shown how to implement the physical constraints of positivity and continuity at $P^2=0$ in NLO calculations which afford a nontrivial choice of suitable (DIS) factorization schemes related to $g_1^γ$ and $F_1^γ$ and appropriate boundary conditions for the polarized parton distributions of real and virtual photons. The predictions of two extreme `maximal' and `minimal' saturation scenarios are presented and compared with results obtained within the framework of a simple quark `box' calculation expected to yield reasonable estimates in the not too small regions of $x$ and $P^2$.
dc.description33 pages, LaTeX, 12 figures
dc.identifierhttps://arxiv.org/abs/hep-ph/0103137
dc.identifierhttp://arxiv.org/abs/hep-ph/0103137
dc.identifierEur.Phys.J.C20:271-281,2001
dc.identifierdoi:10.1007/s100520100677
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/214812
dc.subjectHigh Energy Physics - Phenomenology
dc.titleSpin-Dependent Structure Functions of Real and Virtual Photons
dc.typetext

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