The NLO jet vertex for Mueller-Navelet and forward jets in the   small-cone approximation
  We calculate in the next-to-leading order the impact factor (vertex) for the production of a forward high-$p_T$ jet, in the approximation of small aperture of the jet cone in the pseudorapidity-azimuthal angle plane. The final expression for the vertex turns out to be simple and easy to implement in numerical calculations. 
Dmitry Yu. Ivanov and Alessandro Papa
hep-ph