High-p_T Particles in the Forward Region at HERA
  In order to probe the dynamics of parton evolution in deep inelastic scattering at small x, high-p_T particles produced centrally in pseudorapidity are studied. In the BFKL mechanism gluon radiation is expected to be more abundant than for DGLAP evolution with strong ordering of the gluon transverse momenta, leading to harder p_T spectra. The proposed measurements require charged particle tracking capability as much forward as possible in the HERA laboratory frame, for example with a Very Forward Silicon Tracker, and high luminosity for detailed studies. 
M. Kuhlen