Nucleon strangeness form factors from N_f=2+1 clover fermion lattice QCD

Details Nucleon strangeness form factors from N_f=2+1 clover fermion lattice QCD Nucleon strangeness form factors from N_f=2+1 clover fermion lattice QCD

2009-03-18

arxiv.org/abs/0903.3232v3

Phys.Rev.D80:094503,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 3 figures, added 1 figure in Fig.2, accepted version in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.80.094503

We present the N_f=2+1 clover fermion lattice QCD calculation of the nucleon strangeness form factors. We evaluate disconnected insertions 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), 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.

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