Nucleon strangeness form factors and moments of PDF

Understand

The calculation of the nucleon strangeness form factors from N_f=2+1 clover fermion lattice QCD is presented.

• Disconnected insertions are evaluated using the Z(4) stochastic method, along with unbiased subtractions from the hopping parameter expansion.
• We find that increasing the number of nucleon sources for each configuration improves the signal significantly.
• We obtain G_M^s(0) = -0.017(25)(07), which is consistent with experimental values, and has an order of magnitude smaller error.