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@ARTICLE{Bali:19009,
      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 Schäfer, A. and Schierholz, G. and
                      Sternbeck, A. and Zanotti, J.M.},
      title        = {{S}trange and light quark contributions to the nucleon mass
                      from lattice {QCD}},
      journal      = {Physical review / D},
      volume       = {85},
      number       = {5},
      issn         = {1550-7998},
      address      = {[S.l.]},
      publisher    = {Soc.},
      reportid     = {PreJuSER-19009},
      pages        = {054502},
      year         = {2012},
      note         = {We thank Peter Bruns and Ludwig Greil for discussion. This
                      work was supported by the European Union under Grant No.
                      238353 (ITN STRONGnet) and by the Deutsche
                      Forschungsgemeinschaft SFB/Transregio 55. Sara Collins
                      acknowledges support from the Claussen-Simon-Foundation
                      (Stifterverband fur die Deutsche Wissenschaft). Andre
                      Sternbeck was supported by the EU International
                      Reintegration Grant (IRG) No. 256594. James Zanotti was
                      supported by the Australian Research Council under Grant No.
                      FT100100005 and previously by the Science and Technology
                      Facilities Council under Grant No. ST/F009658/1.
                      Computations were performed on the SFB/TR55 QPACE
                      supercomputers, the BlueGene/P (JuGene) and the Nehalem
                      Cluster (JuRoPA) of the Julich Supercomputer Center, the IBM
                      BlueGene/L at the EPCC (Edinburgh), the SGI Altix ICE
                      machines at HLRN (Berlin/Hannover), and Regensburg's Athene
                      HPC cluster. We thank the support staffs of these
                      institutions. The Chroma software suite [38] was used
                      extensively in this work and gauge configurations were
                      generated using the BQCD code [39] on QPACE and BlueGenes.},
      abstract     = {We determine the strangeness and light quark fractions of
                      the nucleon mass by computing the quark line connected and
                      disconnected contributions to the matrix elements m(q)< N
                      vertical bar(q) over barq vertical bar N > in lattice QCD,
                      using the nonperturbatively 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 flavors. The
                      pion-nucleon sigma term is extrapolated to physical quark
                      masses exploiting the sea quark mass dependence of the
                      nucleon mass. We obtain the renormalized values sigma(pi N)
                      = (38 +/- 12) MeV at the physical point and f(Ts) =
                      sigma(s)/m(N) = 0.012(14)(-3)(+10) for the strangeness
                      contribution at our larger than physical sea quark mass.},
      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    = {Astronomy $\&$ Astrophysics / Physics, Particles $\&$
                      Fields},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000300937900007},
      doi          = {10.1103/PhysRevD.85.054502},
      url          = {https://juser.fz-juelich.de/record/19009},
}