Using the BFKL resummation to fit DIS data: collinear and running coupling effects.

Martin Hentschinski, Agustin Sabio Vera & Clara Salas
The proton structure function $F_2$ is studied in the low x regime using BFKL evolution. The next to leading logarithmic (NLL) analysis requires the inclusion of running coupling effects which lead to off-diagonal terms in the evolution kernel. An all-orders resummation is used to improve the collinear behavior of the NLL BFKL result. We emphasize the theoretical uncertainties that appear throughout the analysis and give a comparison to the combined HERA data.