Topological susceptibility with three flavors of staggered quarks

Abstract

As one test of the validity of the staggered-fermion fourth-root determinant trick, we examine the suppression of the topological susceptibility of the QCD vacuum in the limit of small quark mass. The suppression is sensitive to the number of light sea quark flavors. Our study is done in the presence of 2+1 flavors of dynamical quarks in the improved staggered fermion formulation. Variance-reduction techniques provide better control of statistical errors. New results from staggered chiral perturbation theory account for taste-breaking effects in the low-quark mass behavior of the susceptibility, thereby reducing scaling violations from this source. Measurements over a range of quark masses at two lattice spacings permit a rough continuum extrapolation to remove the remaining lattice artifacts. The results are consistent with chiral perturbation theory with the correct flavor counting.

arXiv commentLattice2004(topology)

References in corpus (9)

• Light hadrons with improved staggered quarks: approaching the continuum limit
• Screening of the topological charge in a correlated instanton vacuum
• Pion and Kaon masses in Staggered Chiral Perturbation Theory
• Partial Flavor Symmetry Restoration for Chiral Staggered Fermions
• Staggered eigenvalue mimicry
• The Index Theorem and Universality Properties of the Low-lying Eigenvalues of Improved Staggered Quarks
• Topological susceptibility with the improved Asqtad action
• Topological susceptibility in full QCD: lattice results versus the prediction from the QCD partition function with granularity
• Topological susceptibility in staggered fermion chiral perturbation theory

Cited by in corpus (2)

• Topological susceptibility with the asqtad action
• Order of the Chiral and Continuum Limits in Staggered Chiral Perturbation Theory