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Strangeness and glue in the nucleon from lattice QCD · Around

2008

Strangeness and glue in the nucleon from lattice QCD

Doi, Takumi, Deka, Mridupawan, Dong, Shao-Jing et al.

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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 <x>_q in the DI, and the strangeness magnetic moment show that the statistical errors are under control with these techniques.

Built on

J. Ashman et al
1989
Earlier work this paper cites.
S.-J. Dong and K.-F. Liu, Stochastic estimation with Z(2) noise
1994
Earlier work this paper cites.
M. Gockeler et al
1997
Earlier work this paper cites.
X.-D. Ji, Gauge invariant decomposition of nucleon spin and its spin-off
1997
Earlier work this paper cites.

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Then

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