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Phys. Rev. D 80, 094503 (2009) [6 pages]

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

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Takumi Doi1,*, Mridupawan Deka1, Shao-Jing Dong1, Terrence Draper1, Keh-Fei Liu1, Devdatta Mankame1, Nilmani Mathur2, and Thomas Streuer3 (χQCD Collaboration)
1Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA
2Department of Theoretical Physics, Tata Institute of Fundamental Research, Mumbai 40005, India
3Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany

Received 18 March 2009; published 10 November 2009

We present the Nf=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 GMs(0)=-0.017(25)(07), where the first error is statistical, and the second is the uncertainties in Q2 and chiral extrapolations. This is consistent with experimental values, and has an order of magnitude smaller error.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevD.80.094503
DOI:
10.1103/PhysRevD.80.094503
PACS:
12.38.Gc, 13.40.−f, 14.20.Dh

*Present address: Graduate School of Pure and Applied Science, University of Tsukuba, Tennodai 1-1-1, Tsukuba, Ibaraki 305-8571, Japan.

doi@pa.uky.edu

 
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