Calculation of the nucleon axial charge in lattice QCD
  Protons and neutrons have a rich structure in terms of their constituents, the quarks and gluons. Understanding this structure requires solving Quantum Chromodynamics (QCD). However QCD is extremely complicated, so we must numerically solve the equations of QCD using a method known as lattice QCD. Here we describe a typical lattice QCD calculation by examining our recent computation of the nucleon axial charge. 
D. B. Renner, R. G. Edwards, G. Fleming, Ph. Hagler, J. W. Negele, K.   Orginos, A. V. Pochinsky, D. G. Richards, W. Schroer...