Topological susceptibility in staggered fermion chiral perturbation theory

Details Topological susceptibility in staggered fermion chiral perturbation theory Topological susceptibility in staggered fermion chiral perturbation theory

2004-06-18

arxiv.org/abs/hep-lat/0406032v1

Phys.Rev.D70:077502,2004

Physics

High Energy Physics

High Energy Physics - Lattice

9 pp., 2 figs., submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.70.077502

The topological susceptibility of the vacuum in quantum chromodynamics has been simulated numerically using the Asqtad improved staggered fermion formalism. At nonzero lattice spacing the residual fermion doublers (fermion ``tastes'') in the staggered fermion formalism give contributions to the susceptibility that deviate from conventional continuum chiral perturbation theory. In this brief report we estimate the taste-breaking artifact and compare it with results of recent simulations, finding that it accounts for roughly half of the scaling violation.

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