NLO jet vertex from Lipatov's QCD effective action
  Real and virtual contributions to the quark-initiated forward jet vertex in QCD are calculated at next-to-leading logarithmic accuracy using Lipatov's effective action, valid in the high energy multi-Regge limit. A regularization of longitudinal divergencies is proposed which allows for the determination of jet observables. Agreement with previous results in the literature is found. 
Martin Hentschinski and Agustin Sabio Vera
hep-ph