The Running BFKL: Resolution of Caldwell's Puzzle
  The HERA data on the proton structure function, $F_2(x,Q^2)$, at very small $x$ and $Q^2$ show the dramatic departure of the logarithmic slope, $\partial F_2/\partial\log Q^2$, from theoretical predictions based on the DGLAP evolution. We show that the running BFKL approach provides the quantitative explanation for the observed $x$ and/or $Q^2$ -dependence of $\partial F_2/\partial\log Q^2$. 
N. N. Nikolaev (FZ-Ikp Juelich) and V. R. Zoller (ITEP Moscow)