The Spin Content of the Nucleon
  The fraction of the nucleon spin that is carried by the quarks, $\Delta \Sigma$, is computed in lattice QCD with dynamical staggered fermions. We obtain the value $\Delta \Sigma = 0.18 \pm 0.02$. 
R. Altmeyer, M. G\"ockeler, R. Horsley, E. Laermann and G. Schierholz