Topological Susceptibility on Dynamical Staggered Fermion Configurations

Abstract

The topological susceptibility is one of the few physical quantities that directly measure the properties of the QCD vacuum. Chiral perturbation theory predicts that in the small quark mass limit the topological susceptibility depends quadratically on the pion mass, approaching zero in the chiral limit. Lattice calculations have difficulty reproducing this behavior. In this paper we study the topological susceptibility on dynamical staggered fermion configurations. Our results indicate that the lattice spacing has to be small, around a~0.1fm for thin link staggered fermion actions to show the expected chiral behavior. Our preliminary result indicates that fat link fermions, on the other hand, reproduce the theoretical expectations even on lattices with a~0.17fm. We argue that this is due to the improved flavor symmetry of fat link fermionic actions.

16 pages, 4 figures

References in corpus (3)

• Flavor Symmetry and the Static Potential with Hypercubic Blocking
• Low-lying fermion modes, topology and light hadrons in quenched QCD
• Dynamical Fermions with Fat Links

Cited by in corpus (16)

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• Effects of non-perturbatively improved dynamical fermions in QCD at fixed lattice spacing
• Testing the fixed-point QCD action and the construction of chiral currents
• The Index Theorem and Universality Properties of the Low-lying Eigenvalues of Improved Staggered Quarks
• Improving the Chiral Properties of Lattice Fermions
• The Low-Lying Dirac Spectrum of Staggered Quarks
• Chiral properties of two-flavor QCD in small volume and at large lattice spacing
• Topological susceptibility with the improved Asqtad action
• Topological Susceptibility in Lattice QCD with Two Flavors of Dynamical Quarks
• Theta vacuum effects on the chiral condensation and the eta^prime meson correlators in the two-flavor massive QED_2 on the lattice
• Mesoscopic QCD and the Theta Vacua
• Topology and Low Lying Fermion Modes
• The locality of the square-root method for improved staggered quarks
• Topological susceptibility in Lattice QCD with unimproved Wilson fermions
• Discretisation effects in the topological susceptibility in lattice QCD
• Dynamical overlap fermions: techniques and results