Nucleon Structure from Lattice QCD
Keh-Fei Liu
Abstract
We report results on the nucleon structure obtained from the lattice quantum chromodynamics calculation. These include the axial, electromagnetic, πNN, and scalar form factors. The calculation is carried out at β= 6 on a 163 × 24 lattice with 24 quenched gauge configurations. The chiral limit results are extrapolated from several light quark cases. For the disconnected insertion (sea-quark contribution), we used the stochastic estimation with the Z2 noise to calculate the diagonal and off-diagonal traces of the inverse matrices with a size of 106 × 106. It is found that the Z2 noise is the optimal choice and its comparison with the Gaussian noise for our quark matrix is given. For the sea-quark contribution, we report results on the strange condensate in the nucleon and the πN σ term.
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