A partially quenched analysis of the eta-eta' system in N_f=2 QCD

Details A partially quenched analysis of the eta-eta' system in N_f=2 QCD A partially quenched analysis of the eta-eta' system in N_f=2 QCD

2004-01-02

arxiv.org/abs/hep-lat/0401004v1

Nucl.Phys.Proc.Suppl.129:218-220,2004

Physics

High Energy Physics

High Energy Physics - Lattice

3 pages, 5 figures, contribution to Lattice2003

Scientific paper

10.1016/S0920-5632(03)02535-0

We report on a first, comprehensive partially quenched study of the eta-eta' problem, based on SESAM configurations on a 16^3x32 lattice at beta=5.6 QCD with two (mass degenerate) active sea quark flavours. By means of the spectral approximation of the two-loop (hairpin) diagrams, we find clear plateau formation in the effective masses which enables us both to determine the eta-eta' mass matrix and the alpha-parameter in the effective chiral Lagrangian for the flavour singlet sector, alpha=0.028 +- 0.013.

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