2011/09/30 by S. Durr, Stephan Dürr, Z. Fodor +23
Physics and Astronomy · #Baryon #Chiral perturbation theory #Content (measure theory) #High-Energy Particle Collisions Research #Hyperon #Lattice QCD #Nucleon #Octet #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Quark #Sigma #Strangeness #hep-lat #hep-ph
paper · pdf · doi:10.1103/physrevd.85.014509
published as Phys. Rev. D 85, 014509 (2012) · LaTeX. 15 pages, 5 figures. Text and results corrected according to Erratum [Phys. Rev. D 93, 039905(E) (2016)]
openalex publication_date 2012/01/26 · arxiv created 2016/02/27 · arxiv updated 2016/03/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 Nf=2+1 lattice ensembles include pion masses down to about 190 MeV in large volumes (M_\ensuremathπL\ensuremath\gtrsim4), and three values of the lattice spacing. Our main results are the nucleon sigma term \ensuremathσ_\ensuremathπN=39(4)(_\ensuremath-7+18) and the strangeness content yN=0.20(7)(_\ensuremath-17+13). Under the assumption of validity of covariant baryon \ensuremathχPT in our range of masses one finds yN=0.276(77)(_\ensuremath-62+90).