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Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/74350

Type: Journal article
Title: Strangeness contribution to the proton spin from lattice QCD
Author: Bali, Gunnar S.
Collins, Sara
Gockeler, Meinulf
Horsley, Roger
Nakamura, Yoshifumi
Nobile, Andrea
Pleiter, Dirk
Rakow, Paul E. L.
Schafer, Andreas
Schierholz, Gerrit
Zanotti, James Michael
QCDSF Collaboration
Citation: Physical Review Letters, 2012; 108(22):222001
Publisher: American Physical Society
Issue Date: 2012
ISSN: 0031-9007
School/Discipline: School of Chemistry and Physics
Statement of
Responsibility: 
Gunnar S. Bali, Sara Collins, Meinulf Göckeler, Roger Horsley, Yoshifumi Nakamura, Andrea Nobile, Dirk Pleiter, P. E. L. Rakow, Andreas Schäfer, Gerrit Schierholz, and James M. Zanotti. (QCDSF Collaboration)
Abstract: We compute the strangeness and light-quark contributions Δs, Δu, and Δd to the proton spin in nf=2 lattice QCD at a pion mass of about 285 MeV and at a lattice spacing a≈0.073  fm, using the nonperturbatively improved Sheikholeslami-Wohlert Wilson action. We carry out the renormalization of these matrix elements, which involves mixing between contributions from different quark flavors. Our main result is the small negative value ΔsMS̅ (√7.4  GeV)=-0.020(10)(4) 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.
Rights: © 2012 American Physical Society
RMID: 0020119447
DOI: 10.1103/PhysRevLett.108.222001
Appears in Collections:Chemistry and Physics publications
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