Nucleon strangeness form factors and moments of PDF

Details Nucleon strangeness form factors and moments of PDF Nucleon strangeness form factors and moments of PDF

2010-10-14

arxiv.org/abs/1010.2834v1

Physics

High Energy Physics

High Energy Physics - Lattice

Talk given at 12th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2010), Williamsbur

Scientific paper

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. Preliminary results for the strangeness contribution to the second moment of the parton distribution function are also presented.

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