A Model Independent Approach to Semi-Inclusive Deep Inelastic Scattering
  We present a method for extraction of detailed information on polarized quark densities from semi-inclusive deep inelastic scattering l+N -> l+h+X, in both LO and NLO QCD without any assumptions about fragmentation functions and polarized sea densities. The only symmetries utilised are charge conjugation and isotopic spin invariance of strong interactions. 
Ekaterina Christova, Elliot Leader