The calculation of the nucleon strangeness form factors from N_f=2+1 clover fermion lattice QCD is presented. Disconnected insertions are evaluated 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), which is consistent with experimental values, and has an order of magnitude smaller error. Preliminary results for the strangeness contribution to the second moment of the parton distribution function are also presented.
@article{arxiv.1010.2834,
title = {Nucleon strangeness form factors and moments of PDF},
author = {Takumi Doi and Mridupawan Deka and Shao-Jing Dong and Terrence Draper and Keh-Fei Liu and Devdatta Mankame and Nilmani Mathur and Thomas Streuer},
journal= {arXiv preprint arXiv:1010.2834},
year = {2015}
}
Comments
Talk given at 12th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon (MENU 2010), Williamsburg, Virginia, USA, 31 May - 4 Jun 2010, 4 pages, 3 figures