Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/74845
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Type: Journal article
Title: A lattice study of the strangeness content of the nucleon
Author: Bali, G.
Collins, S.
Gockeler, M.
Horsley, R.
Nakamura, Y.
Nobile, A.
Pleiter, D.
Rakow, P.
Sternbeck, A.
Schafer, A.
Schierholz, G.
Zanotti, J.
Citation: Progress in Particle and Nuclear Physics, 2012; 67(2):467-472
Publisher: Elsevier Science Bv
Issue Date: 2012
ISSN: 0146-6410
Statement of
Responsibility: 
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)
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.
Keywords: Lattice QCD
Nucleon structure
Nucleon spin
σ-term
Strangeness
Rights: Copyright © 2012 Published by Elsevier B.V.
DOI: 10.1016/j.ppnp.2012.01.012
Grant ID: http://purl.org/au-research/grants/arc/FT100100005
http://purl.org/au-research/grants/arc/FT100100005
Published version: http://dx.doi.org/10.1016/j.ppnp.2012.01.012
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