On the anomalous dimensions of the multiple pomeron exchanges

High energy hard scattering in large N-C limit can be described by the QCD dipole model. In this paper, single, double and triple BFKL pomeron exchange amplitudes are computed explicitly within the dipole model. Based on the calculation, the general formula gamma((k))(0)* = chi(-1) (k chi (1/2)) which governs the anomalous dimension of 1 double right arrow k amplitude is conjectured. As far as the unitarity problem is concerned, we find that the anomalous dimension gamma varies from graph to graph due to the DGLAP evolution. In the end, a comparison between this computation and reggeon field theory is provided. (c) 2007 Elsevier B.V. All rights reserved.