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

T. Doi, M. Deka, S. J. Dong, T. Draper, K. F. Liu, D. Mankame, N. Mathur, T. Streuer

Research output: Contribution to journalConference articlepeer-review


We study the strangeness electromagnetic form factors of the nucleon from the Nf = 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 Gs M(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. We also study the strangeness second moment of the partion distribution function of the nucleon, hx2is s.

Original languageEnglish
JournalProceedings of Science
StatePublished - 2009
Event27th International Symposium on Lattice Field Theory, LAT 2009 - Beijing, China
Duration: Jul 26 2009Jul 31 2009

Bibliographical note

Funding Information:
We thank the CP-PACS/JLQCD Collaborations for their configurations. This work was supported in part by U.S. DOE grant DE-FG05-84ER40154 and Grant-in-Aid for JSPS Fellows 21·5985. Research of N.M. is supported by Ramanujan Fellowship. The calculation was performed at Jefferson Lab, Fermilab and the Univ. of Kentucky, partly using the Chroma Library [25].

Publisher Copyright:
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.

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