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Quenched QCD with fixed-point and chirally improved fermion

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arxiv hep-lat/0209099 v1 pith:AUDQ7J2F submitted 2002-09-10 hep-lat

Quenched QCD with fixed-point and chirally improved fermion

Christof Gattringer , Meinulf G\"ockeler , Peter Hasenfratz , Simon Hauswirth , Kieran Holland , Thomas J\"org , K. J. Juge , C. B. Lang
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Ferenc Niedermayer P.E.L. Rakow Stefan Schaefer Andreas Sch\"afer (BGR (Bern-Graz-Regensburg) collaboration)
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classification hep-lat
keywords pionquenchedchiralchirallyfixed-pointimprovedoperatorsproperties
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In this contribution we present results from quenched QCD simulations with the parameterized fixed-point (FP) and the chirally improved (CI) Dirac operator. Both these operators are approximate solutions of the Ginsparg-Wilson equation and have good chiral properties. We focus our discussion on observables sensitive to chirality. In particular we explore pion masses down to 210 MeV in light hadron spectroscopy, quenched chiral logs, the pion decay constant and the pion scattering length. We discuss finite volume effects, scaling properties of the FP and CI operators and performance issues in their numerical implementation.

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