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https://hdl.handle.net/2440/74845
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dc.contributor.author | Bali, G. | - |
dc.contributor.author | Collins, S. | - |
dc.contributor.author | Gockeler, M. | - |
dc.contributor.author | Horsley, R. | - |
dc.contributor.author | Nakamura, Y. | - |
dc.contributor.author | Nobile, A. | - |
dc.contributor.author | Pleiter, D. | - |
dc.contributor.author | Rakow, P. | - |
dc.contributor.author | Sternbeck, A. | - |
dc.contributor.author | Schafer, A. | - |
dc.contributor.author | Schierholz, G. | - |
dc.contributor.author | Zanotti, J. | - |
dc.date.issued | 2012 | - |
dc.identifier.citation | Progress in Particle and Nuclear Physics, 2012; 67(2):467-472 | - |
dc.identifier.issn | 0146-6410 | - |
dc.identifier.uri | http://hdl.handle.net/2440/74845 | - |
dc.description.abstract | We determine the quark contributions to the nucleon spin Δs, Δu and Δd as well as their contributions to the nucleon mass, the σ-terms. This is done by computing both, the quark line connected and disconnected contributions to the respective matrix elements, using the non-perturbatively improved SheikholeslamiWohlert Wilson Fermionic action. We simulate n F=2 mass degenerate sea quarks with a pion mass of about 285 MeV and a lattice spacing a≈0.073 fm. The renormalization of the matrix elements involves mixing between contributions from different quark flavours. The pionnucleon σ-term is extrapolated to physical quark masses exploiting the sea quark mass dependence of the nucleon mass. We obtain the renormalized value σ πN=(38±12) MeV at the physical point and the strangeness fraction f Ts=σ s/m N=0.012(14)- 3+10 at our larger than physical sea quark mass. For the strangeness contribution to the nucleon spin we obtain ΔsMS̄ (7.4GeV)=-0.020(10) (1). © 2012 Elsevier B.V. All rights reserved. | - |
dc.description.statementofresponsibility | G.S. Bali, S. Collins, M. Göckeler, R. Horsley, Y. Nakamura, A. Nobile, D. Pleiter, P.E.L. Rakow, A. Sternbeck, A. Schäfer, G. Schierholz, J.M. Zanotti, (QCDSF Collaboration) | - |
dc.language.iso | en | - |
dc.publisher | Elsevier Science Bv | - |
dc.rights | Copyright © 2012 Published by Elsevier B.V. | - |
dc.source.uri | http://dx.doi.org/10.1016/j.ppnp.2012.01.012 | - |
dc.subject | Lattice QCD | - |
dc.subject | Nucleon structure | - |
dc.subject | Nucleon spin | - |
dc.subject | σ-term | - |
dc.subject | Strangeness | - |
dc.title | A lattice study of the strangeness content of the nucleon | - |
dc.type | Journal article | - |
dc.identifier.doi | 10.1016/j.ppnp.2012.01.012 | - |
dc.relation.grant | http://purl.org/au-research/grants/arc/FT100100005 | - |
dc.relation.grant | http://purl.org/au-research/grants/arc/FT100100005 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Zanotti, J. [0000-0002-3936-1597] | - |
Appears in Collections: | Aurora harvest 4 Physics publications |
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