Transverse Momentum in Semi-inclusive Deep Inelastic Scattering
  Within the framework of perturbative Quantum Chromodynamics we derive transverse momentum dependent distributions describing both current and target fragmentation in semi-inclusive Deep Inelastic Scattering. We present, to leading logarithmic accuracy, the corresponding crosssections describing final state hadrons on the whole phase space. Phenomenological implications and further developments are briefly discussed. 
Federico Alberto Ceccopieri, Luca Trentadue