Quark Loop Effects with an Improved Staggered Action

Abstract

We have been studying effects of dynamical quarks on various hadronic observables, using our recently formulated improvement for staggered fermions. To illustrate improvement, we show that the light hadron spectrum in the quenched approximation gives remarkably good scaling. We highlight three new results: (1) We find no apparent quark loop effects in the Edinburgh plot with 2+1 flavors of dynamical quarks at a = 0.14 fm. (2) We show that dynamical quarks modify the shape of the heavy quark potential. (3) We present results hinting at meson decay effects in light hadron spectroscopy.

5 pages, 7 figures, Lattice 2000 (Spectrum)

References in corpus (5)

• Tests of Improved Kogut-Susskind Fermion Actions
• Continuum limit of lattice QCD with staggered quarks in the quenched approximation - a critical role for the chiral extrapolation
• Improved flavor symmetry in Kogut-Susskind fermion actions
• Light hadron spectrum with Kogut-Susskind quarks
• Light quark spectrum with improved gauge and fermion actions