title: AdS black disk model for small-x deep inelastic scattering.
abstract: Using the approximate conformal invariance of QCD at high energies we consider a simple anti-de Sitter black disk model to describe saturation in deep inelastic scattering. Deep inside saturation the structure functions have the same power law scaling, F{T}∼F{L}∼x{-ω}, where ω is related to the expansion rate of the black disk with energy. Furthermore, the ratio F{L}/F{T} is given by the universal value 1+ω/3+ω, independently of the target. For γ{*}-γ{*} scattering at high energies we obtain explicit expressions and ratios for the total cross sections of transverse and longitudinal photons in terms of the single parameter ω.
authors.affiliation: Centro de Física do Porto e Departamento de Física e Astronomia da Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre 687, 4169-007 Porto, Portugal.
authors.forename: Lorenzo
authors.initials: L
authors.lastname: Cornalba
authors.forename: Miguel S
authors.initials: MS
authors.lastname: Costa
authors.forename: João
authors.initials: J
authors.lastname: Penedones