Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-10-11
JHEP 0801:026,2008
Physics
High Energy Physics
High Energy Physics - Theory
Version accepted for publication in JHEP (minor corrections of style)
Scientific paper
10.1088/1126-6708/2008/01/026
For gauge theories which admit a dual string description, we analyze deep inelastic scattering at strong 't Hooft coupling and high energy, in the vicinity of the unitarity limit. We discuss the onset of unitarity corrections and determine the saturation line which separates weak scattering from strong scattering in the parameter space of rapidity and photon virtuality. We discover that the approach towards unitarity proceeds through two different mechanisms, depending upon the photon virtuality Q^2 : single Pomeron exchange at relatively low Q^2 and, respectively, multiple graviton exchanges at higher Q^2. This implies that the total cross-section at high energy and large Q^2 is dominated by diffractive processes. This is furthermore suggestive of a partonic description where all the partons have transverse momenta below the saturation momentum and occupation numbers of order one.
Hatta Yoshitaka
Iancu Edmond
Mueller Alfred H.
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