The QCD spin chain S matrix

Beisert et al. have identified an integrable SU(2, 2) quantum spin chain which gives the one-loop anomalous dimensions of certain operators in large Nc QCD. We derive a set of nonlinear integral equations (NLIEs) for this model, and compute the scattering matrix of the various (in particular, magnon) excitations. 1 Department of Physics, Ewha Womans University, Seoul 120-750, South Korea 2 Physics Department, P.O. Box 248046, University of Miami, Coral Gables, FL 33124 USA 3 Department of Physics, Faculty of Science, Shizuoka University, Ohya 836, Shizuoka, Japan