Topological susceptibility with the improved Asqtad action
MILC Collaboration: C. Bernard (Washington U), T. Burch (U Arizona),, T.A. DeGrand (U Colorado), C.E. DeTar (U Utah), Steven Gottlieb (U Indiana),, E. Gregory (U Arizona), A. Hasenfratz (U Colorado), U.M. Heller (CSIT FSU),, J. Hetrick (U Pacific), J. Osborn (U Utah)
TL;DR
This paper investigates the topological susceptibility using the improved Asqtad action in lattice QCD, comparing results with chiral perturbation theory and observing persistent topological charge over simulation time.
Contribution
It provides the first measurements of topological susceptibility with the improved Asqtad action and compares these results to theoretical predictions.
Findings
Agreement with chiral perturbation theory at small lattice spacing
Persistent topological charge over Monte Carlo time
Preliminary results indicating the action's chiral properties
Abstract
As a test of the chiral properties of the improved Asqtad (staggered fermion) action, we have been measuring the topological susceptibility as a function of quark masses for 2 + 1 dynamical flavors. We report preliminary results, which show reasonable agreement with leading order chiral perturbation theory for lattice spacing less than 0.1 fm. The total topological charge, however, shows strong persistence over Monte Carlo time.
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