The nucleon axial charge from lattice QCD with controlled errors
  We report on our calculation of the nucleon axial charge gA in QCD with two flavours of dynamical quarks. A detailed investigation of systematic errors is performed, with a particular focus on contributions from excited states to three-point correlation functions. The use of summed operator insertions allows for a much better control over such contamination. After performing a chiral extrapolation to the physical pion mass, we find gA=1.223 +/- 0.063 (stat) +0.035 -0.060 (syst), in good agreement with the experimental value. 
S. Capitani, M. Della Morte, G. von Hippel, B. J\"ager, A. J\"uttner,   B. Knippschild, H.B. Meyer, H. Wittig
hep-lat hep-ph nucl-th