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Sigma term and strangeness content of octet baryons

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arxiv 1109.4265 v3 pith:2KP3M6DK submitted 2011-09-20 hep-lat hep-ph

S. Durr , Z. Fodor , T. Hemmert , C. Hoelbling , J. Frison , S. D. Katz , S. Krieg , T. Kurth
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L. Lellouch T. Lippert A. Portelli A. Ramos A. Schafer K. K. Szabo
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classification hep-lathep-ph
keywords sigmacontentlatticemassesoctetstrangenessbaryonbaryons
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By using lattice QCD computations we determine the sigma terms and strangeness content of all octet baryons by means of an application of the Hellmann-Feynman theorem. In addition to polynomial and rational expressions for the quark mass dependence of octet members, we use SU(3) covariant baryon chiral perturbation theory to perform the extrapolation to the physical up and down quark masses. Our N_f=2+1 lattice ensembles include pion masses down to about 190 MeV in large volumes (M_\pi L > 4), and three values of the lattice spacing. Our main results are the nucleon sigma term \sigma_{\pi N} = 39(4)(^{+18}_{-7}) and the strangeness content y_{N} = 0.20(7)(^{+13}_{-17}). Under the assumption of validity of covariant baryon \chi PT in our range of masses one finds y_{N} = 0.276(77)(^{+90}_{-62}).

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Cited by 2 Pith papers

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  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. FLAG Review 2024

    hep-lat 2024-11 accept novelty 2.0 of 10

    The FLAG 2024 review provides updated averages of lattice QCD determinations for quark masses, decay constants, form factors, mixing parameters, and nucleon matrix elements.

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