The sigma commutator from lattice QCD

  title={The sigma commutator from lattice QCD},
  author={Stewart V. Wright and Derek Leinweber and Anthony W. Thomas},
  journal={Nuclear Physics},
As a direct source of information on chiral symmetry breaking within QCD, the sigma commutator is of considerable importance. Since hadron structure is a non-perturbative problem, numerical calculations on a space-time lattice are currently the only rigorous approach. With recent advances in the calculation of hadron masses within full QCD, it is of interest to see whether the sigma commutator can be calculated directly from the dependence of the nucleon mass on the input quark mass. We show… Expand
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