NLO analysis of SLAC E154 data

The next-to-leading order pQCD analysis of the world data on the polarized structure functions g1 of the neutron (including the new E154 results) proton and deuteron is presented. The E154 results are interpreted in that context. Special attention is paid to the experimental and theoretical uncertainties. The data well constrain the valence helicity distributions and only qualitatively those of the gluon and sea quarks. The NLO fit is used to evolve the experimental results to a constant Q2=5 GeV2, and to determine the integrals of g1 of the neutron and proton to find agreement with the Bjorken sum rule