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AdS black disk model for small-x DIS | | Lorenzo Cornalba
; Miguel S. Costa
; Joao Penedones
; | | Date: |
7 Jan 2010 | | Abstract: | Using the approximate conformal invariance of QCD at high energies, we study
saturation in Deep Inelastic Scattering (DIS) from the dual AdS perspective. We
consider a simple AdS black disk model to describe the small Bjorken x regime
inside the saturation region. Deep inside saturation the transverse and
longitudinal structure functions have the same power law scaling, F_T ~ F_L ~
1/x^w, where the exponent w is related to the expansion rate of the black disk
with energy. Furthermore, in this kinematical regime the ratio F_L/F_T is given
by the universal value (1+w)/(3+w), independently of the target. We also
consider virtual photon-photon scattering at high energies and obtain explicit
expressions and ratios for the total cross sections of transversally and
longitudinally polarized photons in terms of the single parameter w of the
black disk model. | | Source: | arXiv, 1001.1157 | | Services: | Forum | Review | PDF | Favorites | |
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