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

Details The calculation of nucleon strangeness form factors from N_f=2+1 clover fermion lattice QCD The calculation of nucleon strangeness form factors from N_f=2+1 clover fermion lattice QCD

2009-10-14

arxiv.org/abs/0910.2687v1

PoS LAT2009:134,2009

Physics

High Energy Physics

High Energy Physics - Lattice

Talk given at 27th International Symposium on Lattice Field Theory (Lattice 2009), Beijing, China, 25-31 Jul 2009, 7 pages, 3

Scientific paper

We study the strangeness electromagnetic form factors of the nucleon from the N_f=2+1 clover fermion lattice QCD calculation. The disconnected insertions are evaluated using the Z(4) stochastic method, along with unbiased subtractions from the hopping parameter expansion. In addition to increasing the number of Z(4) noises, 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), where the first error is statistical, and the second is the uncertainties in Q^2 and chiral extrapolations. This is consistent with experimental values, and has an order of magnitude smaller error. We also study the strangeness second moment of the partion distribution function of the nucleon, _{s-\bar{s}}.

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