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S. Güsken, P. Ueberholz, J. Viehoff, N. Eicker, T. Lippert, K. Schilling, A. Spitz and T. Struckmann [T χ \chi L Collaboration], Phys. Rev. D 59
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S. Capitani, M. Göckeler, R. Horsley, H. Perlt, P. E. L. Rakow, G. Schierholz and A. Schiller [QCDSF Collaboration], Nucl. Phys. B593
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M. Göckeler, R. Horsley, D. Pleiter, P. E. L. Rakow, S. Schaefer, A. Schäfer, and G. SchierholzM. Göckeler, R. Horsley, D. Pleiter, P. E. L. Rakow, S. Schaefer, A. Schäfer, and G. Schierholz [QCDSF Collaboration], Phys. Lett. B 545
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M. Göckeler, R. Horsley, A. C. Irving, D. Pleiter, P. E. L. Rakow, G. Schierholz and H. Stüben [QCDSF and UKQCD Collaborations], Phys. Lett. B 639
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2011

Strangeness Contribution to the Proton Spin from Lattice QCD

Bali, Gunnar S., Collins, Sara, Gockeler, Meinulf et al.

Understand

We compute the strangeness and light-quark contributions Delta s, Delta u and Delta d to the proton spin in nf=2 lattice QCD at a pion mass of about 285 MeV and at a lattice spacing a approx 0.073 fm, using the non-perturbatively improved Sheikholeslami-Wohlert Wilson action.

We carry out the renormalization of these matrix elements which involves mixing between contributions from different quark flavours.
Our main result is the small negative value MSbar scheme value Delta s = -0.020(10)(4), at a scale mu = 7.4 GeV, of the strangeness contribution to the nucleon spin.
The second error is an estimate of the uncertainty, due to the missing extrapolation to the physical point.

Built on

J. Kodaira, Nucl. Phys. B165
1980
Earlier work this paper cites.
S. A. Larin, Phys. Lett. B 303
1993
Earlier work this paper cites.
S. J. Dong, J.-F. Lagaë and K.-F. Liu, Phys. Rev. Lett. 75
1995
Earlier work this paper cites.
X.-D. Ji, Phys. Rev. Lett. 78
1997
Earlier work this paper cites.
M. J. Savage and J. Walden, Phys. Rev. D 55
1997
Earlier work this paper cites.
S. Güsken, P. Ueberholz, J. Viehoff, N. Eicker, T. Lippert, K. Schilling, A. Spitz and T. Struckmann [T χ \chi L Collaboration], Phys. Rev. D 59
1999
Earlier work this paper cites.
S. Capitani, M. Göckeler, R. Horsley, H. Perlt, P. E. L. Rakow, G. Schierholz and A. Schiller [QCDSF Collaboration], Nucl. Phys. B593
2001
Earlier work this paper cites.
M. Göckeler, R. Horsley, D. Pleiter, P. E. L. Rakow, S. Schaefer, A. Schäfer, and G. SchierholzM. Göckeler, R. Horsley, D. Pleiter, P. E. L. Rakow, S. Schaefer, A. Schäfer, and G. Schierholz [QCDSF Collaboration], Phys. Lett. B 545
2002
Earlier work this paper cites.
M. Göckeler, R. Horsley, A. C. Irving, D. Pleiter, P. E. L. Rakow, G. Schierholz and H. Stüben [QCDSF and UKQCD Collaborations], Phys. Lett. B 639
2005
Earlier work this paper cites.
A. A. Khan, et al
2006
Earlier work this paper cites.
M. Göckeler, R. Horsley, A. C. Irving, D. Pleiter, P. E. L. Rakow, G. Schierholz and H. Stüben [QCDSF Collaboration], Phys. Rev. D 73
2006
Earlier work this paper cites.