Strangeness and glue in the nucleon from lattice QCD

Details Strangeness and glue in the nucleon from lattice QCD Strangeness and glue in the nucleon from lattice QCD

2008-10-14

arxiv.org/abs/0810.2482v1

PoS LATTICE2008:163,2008

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 4 figures; Talk given at 26th International Symposium on Lattice Field Field: Lattice 2008, Williamsburg, Virginia, U

Scientific paper

We study the strangeness contribution to nucleon matrix elements using Nf=2+1 dynamical clover fermion configurations generated by the CP-PACS/JLQCD collaboration. In order to evaluate the disconnected insertion (DI), we use the Z(4) stochastic method, along with unbiased subtraction from the hopping parameter expansion which reduces the off-diagonal noises in the stochastic method. Furthermore, we find that using many nucleon sources for each configuration is effective in improving the signal. Our results for the quark contribution to the first moment _q in the DI, and the strangeness magnetic moment show that the statistical errors are under control with these techniques. We also study the gluonic contribution to the nucleon using the overlap operator to construct the gauge field tensor, F_{mu,nu}. The application to the calculation of first moment, _G, gives a good signal in quenched lattice QCD.

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