Paper
An "all-poles" approximation to collinear resummations in the Regge limit of perturbative QCD
Authors
Agustin Sabio Vera
Abstract
The procedure to improve the convergence in transverse momentum space of the NLL BFKL kernel using a w-shift is revisited. An accurate approximation to this shift only depending on transverse momenta is presented. This approximation is based on a Bessel function of the first kind with argument depending on the strong coupling and a double logarithm of the ratio of transverse scales. A comparison between different renormalization schemes is also included.