Reggeization of quark-quark scattering amplitude in QCD
V. S. Fadin, R. Fiore, A. Quartarolo
Abstract
s-channel discontinuity of quark-quark scattering amplitude with gluon quantum numbers in the t channel and negative signature is calculated in the Regge kinematical region in the two-loop approximation. Using this discontinuity and assuming that the Regge asymptotic behaviour is given by the Reggeized gluon contribution, we calculate the gluon trajectory in the two-loop approximation. Remarkable cancellations lead to the independence of the trajectory on properties of the scattered quarks, confirming the gluon Reggeization.
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