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The strange and light quark contributions to the nucleon mass from Lattice QCD

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arxiv 1111.1600 v2 pith:HAEPTUE7 submitted 2011-11-07 hep-lat hep-ph

Gunnar S. Bali , Sara Collins , Meinulf Gockeler , Roger Horsley , Yoshifumi Nakamura , Andrea Nobile , Dirk Pleiter , P. E. L. Rakow
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Andreas Schafer Gerrit Schierholz Andre Sternbeck James M. Zanotti (QCDSF Collaboration)
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classification hep-lathep-ph
keywords massquarkcontributionslatticenucleonphysicalelementslight
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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|qbar q|N> in lattice QCD, 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 approx 0.073 fm. The renormalization of the matrix elements involves mixing between contributions from different quark flavours. 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_{T_s}=\sigma_s/m_N= 0.012(14)^{+10}_{-3} for the strangeness contribution at our larger than physical sea quark mass.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Unveiling the Strong Interaction origin of Baryon Masses with Lattice QCD

    hep-lat 2024-11 conditional novelty 6.0 of 10

    First-principles lattice QCD decomposes baryon masses into quark sigma terms and a roughly flavor-independent gluon trace anomaly around 1 GeV.

  2. Nucleon axial, tensor and scalar charges and $\sigma$-terms in lattice QCD

    hep-lat 2019-09 conditional novelty 6.0 of 10

    Lattice QCD at physical pion mass with Nf=2+1+1 twisted mass fermions yields g_A^{u-d}=1.286(23), sigma_piN=41.6(3.8) MeV and per-flavor charges including charm.

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