Towards measuring the eta' mass with N_f=2+1 staggered fermions

Details Towards measuring the eta' mass with N_f=2+1 staggered fermions Towards measuring the eta' mass with N_f=2+1 staggered fermions

2005-11-17

arxiv.org/abs/hep-lat/0511038v1

Nucl.Phys.Proc.Suppl. 153 (2006) 139-145

Physics

High Energy Physics

High Energy Physics - Lattice

7 pages, 5 figures, to appear in proceedings of Computational Hadron Physics, Nicosia, Cyprus, 14-17 Sep 2005

Scientific paper

10.1016/j.nuclphysbps.2006.01.02

Because the propagators of flavor-singlet states incorporate disconnected diagrams, they are uniquely sensitive to any differences in the actions governing sea and valence fermions on the lattice. As such, they present an important test of the validity of the ``fourth-root trick'' in the staggered fermion formulation. The pseudoscalar's relationship to topological charge also makes it of theoretical interest. We present preliminary results from our measurements of flavor-singlet pseudoscalar mesons on 2+1 flavor Asqtad lattices, and discuss some strategies for improving the signal-to-error ratio of disconnected singlet correlators.

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