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@ARTICLE{Bali:21703,
      author       = {Bali, G.S. and Collins, S. and Göckeler, M. and Horsley,
                      R. and Nakamura, Y. and Nobile, A. and Pleiter, D. and
                      Rakow, P.E.L. and Sternbeck, A. and Schäfer, A. and
                      Schierholz, G. and Zanotti, J.M.},
      title        = {{A} lattice study of the strangeness content of the
                      nucleon},
      journal      = {Progress in particle and nuclear physics},
      volume       = {67},
      issn         = {0146-6410},
      address      = {Oxford [u.a.]},
      publisher    = {Pergamon Press},
      reportid     = {PreJuSER-21703},
      pages        = {467 - 472},
      year         = {2012},
      note         = {This work was supported by the European Union (grant
                      238353, ITN STRONGnet) and by the DFG SFB/Transregio 55.
                      S.C. is supported by the Claussen-Simon-Foundation
                      (Stifterverband fur die Deutsche Wissenschaft), A.St. by the
                      EU IRG grant 256594 and J.Z. by the Australian Research
                      Council grant FT100100005. Computations were performed on
                      the SFB/TR55 QPACE supercomputers, the BlueGene/P (JuGene)
                      and the Nehalem cluster (JuRoPA) of the JSC (Julich), the
                      IBM BlueGene/L at the EPCC (Edinburgh), the SGI Altix ICE
                      machines at HLRN (Berlin/Hannover) and Regensburg's Athene
                      HPC cluster. The Chroma software suite [24] was used
                      extensively in this work.},
      abstract     = {We determine the quark contributions to the nucleon spin
                      Delta s, Delta u and Ad as well as their contributions to
                      the nucleon mass, the a-terms. This is done by computing
                      both, the quark line connected and disconnected
                      contributions to the respective matrix elements, using the
                      non-perturbatively improved Sheikholeslami-Wohlert 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 approximate to 0.073 fm. The renormalization of
                      the matrix elements involves mixing between contributions
                      from different quark flavours. The pion-nucleon a-term is
                      extrapolated to physical quark masses exploiting the sea
                      quark mass dependence of the nucleon mass. We obtain the
                      renormalized value sigma(pi N) = (38 +/- 12) MeV at the
                      physical point and the strangeness fraction f(Ts) = sigma
                      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 Delta s ((MS)) over bar(root 7.4 GeV) =
                      -0.020(10)(1). (C) 2012 Published by Elsevier B.V.},
      keywords     = {J (WoSType)},
      cin          = {JSC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {Scientific Computing (FUEK411) / 411 - Computational
                      Science and Mathematical Methods (POF2-411) / STRONGNET -
                      Strong Interaction Supercomputing Training Network (238353)
                      / PRECISION LATTICEQCD - Precision lattice QCD calculations
                      (256594)},
      pid          = {G:(DE-Juel1)FUEK411 / G:(DE-HGF)POF2-411 /
                      G:(EU-Grant)238353 / G:(EU-Grant)256594},
      shelfmark    = {Physics, Nuclear / Physics, Particles $\&$ Fields},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000303282200062},
      doi          = {10.1016/j.ppnp.2012.01.012},
      url          = {https://juser.fz-juelich.de/record/21703},
}