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- W2054320632 abstract "We analyze Nf=2 nucleon mass data with respect to their dependence on the pion mass down to mpi = 157 MeV and compare it with predictions from covariant baryon chiral perturbation theory (BChPT). A novel feature of our approach is that we fit the nucleon mass data simultaneously with the directly obtained pion-nucleon sigma-term. Our lattice data below mpi = 435 MeV is well described by O(p^4) BChPT and we find sigma=37(8)(6) MeV for the sigma-term at the physical point. Using the nucleon mass to set the scale we obtain a Sommer parameter of r_0=0.501(10)(11) fm." @default.
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- W2054320632 date "2013-01-01" @default.
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- W2054320632 title "Nucleon mass and sigma term from lattice QCD with two light fermion flavors" @default.
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- W2054320632 doi "https://doi.org/10.1016/j.nuclphysb.2012.08.009" @default.
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