2005/11/17 by Eric B. Gregory, Alan Irving, A.C. Irving +3
Physics and Astronomy · Psychology · #Atomic and Subatomic Physics Research #Fermion #History #Particle physics #Particle physics theoretical and experimental studies #Physics #Psychology #Quantum Chromodynamics and Particle Interactions #hep-lat
paper · pdf · doi:10.1016/j.nuclphysbps.2006.01.021
published as Nucl.Phys.Proc.Suppl. 153 (2006) 139-145 · 7 pages, 5 figures, to appear in proceedings of Computational Hadron Physics, Nicosia, Cyprus, 14-17 Sep 2005
arxiv created 2005/11/17 · openalex publication_date 2006/02/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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.