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      Comment on "Chiral anomalies and rooted staggered fermions"

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          Abstract

          In hep-lat/0701018, Creutz claims that the rooting trick used in simulations of staggered fermions to reduce the number of tastes misses key physics whenever the desired theory has an odd number of continuum flavors, and uses this argument to call into question the rooting trick in general. Here we show that his argument fails as the continuum limit is approached, and therefore does not imply any problem for staggered simulations. We also show that the cancellations necessary to restore unitarity in physical correlators in the continuum limit are a straightforward consequence of the restoration of taste symmetry.

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          Most cited references 31

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          Large N chiral dynamics

           E. Witten (1980)
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            The glueball spectrum from an anisotropic lattice study

            The spectrum of glueballs below 4 GeV in the SU(3) pure-gauge theory is investigated using Monte Carlo simulations of gluons on several anisotropic lattices with spatial grid separations ranging from 0.1 to 0.4 fm. Systematic errors from discretization and finite volume are studied, and the continuum spin quantum numbers are identified. Care is taken to distinguish single glueball states from two-glueball and torelon-pair states. Our determination of the spectrum significantly improves upon previous Wilson action calculations.
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              Some Features of Chiral Symmetry Breaking

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                Author and article information

                Journal
                29 March 2006
                2007-04-13
                Article
                10.1016/j.physletb.2007.04.018
                hep-lat/0603027
                Custom metadata
                Phys.Lett.B649:235-240,2007
                11 pages, version 3 (4/13/07): Revisions to correspond to Creutz's latest posting, including a change in the title. Version to appear in Physics Letters B
                hep-lat

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