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Strange and light quark contributions to the nucleon mass from lattice QCD

Gunnar S. Bali1,*, Sara Collins1,†, Meinulf Göckeler1, Roger Horsley2, Yoshifumi Nakamura3, Andrea Nobile1, Dirk Pleiter4,1, P. E. L. Rakow5, Andreas Schäfer1 et al. (QCDSF Collaboration)

Andreas Schäfer1, Gerrit Schierholz6, André Sternbeck1, and James M. Zanotti7,2 (QCDSF Collaboration)

  • 1Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany
  • 2School of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
  • 3RIKEN Advanced Institute for Computational Science, Kobe, Hyogo 650-0047, Japan
  • 4JSC, Research Center Jülich, 52425 Jülich, Germany
  • 5Theoretical Physics Division, Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX, United Kingdom
  • 6Deutsches Elektronen-Synchrotron DESY, 22603 Hamburg, Germany
  • 7Special Research Centre for the Subatomic Structure of Matter, School of Chemistry & Physics, University of Adelaide, South Australia 5005, Australia

  • *gunnar.bali@ur.de
  • †sara.collins@physik.uni-regensburg.de
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Phys. Rev. D 85, 054502 – Published 1 March, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.054502

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 mq⟨N|q¯q|N⟩ in lattice QCD, using the nonperturbatively improved Sheikholeslami-Wohlert Wilson fermionic action. We simulate nF=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 flavors. The pion-nucleon σ term is extrapolated to physical quark masses exploiting the sea quark mass dependence of the nucleon mass. We obtain the renormalized values σπN=(38±12)  MeV at the physical point and fTs=σs/mN=0.012(14)−3+10 for the strangeness contribution at our larger than physical sea quark mass.

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Phys. Rev. D 85, 054502– Published 1 March, 2012
  • Received 7 November 2011

© 2012 American Physical Society

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