Journal Article

FZJ-2019-01098

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Flavor singlet pseudoscalar masses in N f = 2 QCD

Struckmann, T. ; Schilling, K.Extern* ; Bali, G. ; Eicker, N.FZJ* ; Güsken, S. ; Lippert, T.FZJ* ; Neff, H. ; Orth, B.FZJ* ; Schroers, W. ; Viehoff, J. ; Ueberholz, P.

2001
Inst.812068 Melville, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevD.63.074503

Abstract: We perform a lattice mass analysis in the flavor singlet pseudoscalar channel on the SESAM and TχL full QCD vacuum configurations, with 2 active flavors of dynamical Wilson fermions at β=5.6. At our inverse lattice spacing, a−1≈2.3 GeV, we retrieve by a chiral extrapolation to the physical light quark masses the value mη′=3.7+8−4mπ. A crude extrapolation from (Nf=3) phenomenology would suggest mη′≈5.1mπ for Nf=2 QCD. We verify that the mass gap between the singlet state η′ and the π flavor triplet state is due to gauge configurations with nontrivial topology.

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