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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 |
Appears in Collections: | Aurora harvest 4 Physics publications |
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