Journal Article

FZJ-2019-01091

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Pion-nucleon σ term with dynamical Wilson fermions

Güsken, S. ; Ueberholz, P. ; Viehoff, J. ; Eicker, N.FZJ* ; Lacock, P. ; Lippert, T.FZJ* ; Schilling, K.Extern* ; Spitz, A. ; Struckmann, T.

1999
Inst.812068 Melville, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevD.59.054504

Abstract: We 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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