%0 Journal Article
%A Struckmann, T.
%A Schilling, K.
%A Bali, G.
%A Eicker, N.
%A Güsken, S.
%A Lippert, Th.
%A Neff, H.
%A Orth, B.
%A Schroers, W.
%A Viehoff, J.
%A Ueberholz, P.
%T Flavor singlet pseudoscalar masses in N f = 2 QCD
%J Physical review / D
%V 63
%N 7
%@ 0556-2821
%C Melville, NY
%I Inst.812068
%M FZJ-2019-01098
%P 074503
%D 2001
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1103/PhysRevD.63.074503
%U https://juser.fz-juelich.de/record/860323