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

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arxiv 0903.3232 v3 pith:4GCYKUA4 submitted 2009-03-18 hep-ph hep-latnucl-exnucl-th

Takumi Doi , Mridupawan Deka , Shao-Jing Dong , Terrence Draper , Keh-Fei Liu , Devdatta Mankame (Kentucky U.) , Nilmani Mathur (Tata Inst.) , Thomas Streuer (Regensburg U.) This is my paper
classification hep-phhep-latnucl-exnucl-th
keywords nucleonclovererrorfactorsfermionformlatticestrangeness
verification ladder T0 review T1 audit T2 compute T3 formal
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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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