Virtual Next-to-Leading Corrections to the Lipatov Vertex
  We compute the virtual next-to-leading corrections to the Lipatov vertex in the helicity-amplitude formalism. These agree with previous results by Fadin and collaborators, in the conventional dimensional-regularization scheme. We discuss the choice of reggeization scale in order to minimize its impact on the next-to-leading-logarithmic corrections to the BFKL equation. 
Vittorio Del Duca and Carl R. Schmidt