Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/74350
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Type: | Journal article |
Title: | Strangeness contribution to the proton spin from lattice QCD |
Author: | Bali, G. Collins, S. Gockeler, M. Horsley, R. Nakamura, Y. Nobile, A. Pleiter, D. Rakow, P. Schafer, A. Schierholz, G. Zanotti, J. |
Citation: | Physical Review Letters, 2012; 108(22):222001:1-222001:5 |
Publisher: | American Physical Soc |
Issue Date: | 2012 |
ISSN: | 0031-9007 1079-7114 |
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. |
Keywords: | QCDSF Collaboration |
Rights: | © 2012 American Physical Society |
DOI: | 10.1103/PhysRevLett.108.222001 |
Grant ID: | http://purl.org/au-research/grants/arc/FT100100005 http://purl.org/au-research/grants/arc/FT100100005 |
Published version: | http://dx.doi.org/10.1103/physrevlett.108.222001 |
Appears in Collections: | Aurora harvest Chemistry and Physics publications |
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hdl_74350.pdf | Published version | 157.82 kB | Adobe PDF | View/Open |
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