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Adelaide Research and Scholarship
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Schools and Disciplines
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School of Chemistry and Physics
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Chemistry and Physics Publications
Please use this identifier to cite or link to this item:
http://hdl.handle.net/2440/74350
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| Type: | Journal article |
| Title: | Strangeness contribution to the proton spin from lattice QCD |
| Author: | Bali, Gunnar S.
Collins, Sara
Göckeler, Meinulf
Horsley, Roger
Nakamura, Yoshifumi
Nobile, Andrea
Pleiter, Dirk
Rakow, Paul E. L.
Schäfer, 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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