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000860316 1001_ $$0P:(DE-HGF)0$$aGüsken, S.$$b0
000860316 245__ $$aPion-nucleon σ term with dynamical Wilson fermions
000860316 260__ $$aMelville, NY$$bInst.812068$$c1999
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000860316 520__ $$aWe calculate connected and disconnected contributions to the flavor singlet scalar density amplitude of the nucleon in a full QCD lattice simulation with nf=2 dynamical Wilson fermions at β=5.6 on a 163×32 lattice. We find that both contributions are of similar size at the light quark mass. We arrive at the estimate σπN=18(5)MeV. Its smallness is directly related to the apparent decrease of u, d quark masses when unquenching QCD lattice simulations. The y parameter can be estimated from a semi-quenched analysis, in which there are no strange quarks in the sea, the result being y=0.59(13).
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000860316 7001_ $$0P:(DE-Juel1)132179$$aLippert, T.$$b5$$ufzj
000860316 7001_ $$0P:(DE-HGF)0$$aSchilling, K.$$b6
000860316 7001_ $$0P:(DE-HGF)0$$aSpitz, A.$$b7
000860316 7001_ $$0P:(DE-HGF)0$$aStruckmann, T.$$b8
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