A New Method to Probe the low $x$ Parton Dynamics at HERA
  Hadron transverse momentum spectra are proposed as a means to probe the underlying partonic dynamics in deep inelastic scattering. The BFKL evolution equation, postulated for small Bjorken-$x$, leads to an enhanced parton emission over the conventional DGLAP ansatz, and can thus be tested. 
M. Kuhlen