SU(3) breaking and the pseudo-scalar spectrum in multi-taste QCD
Michael Creutz
TL;DR
This paper investigates the effects of SU(3) symmetry breaking on the pseudo-scalar spectrum in multi-taste QCD, highlighting differences between Wilson and staggered fermion approaches and their impact on physical and spurious states.
Contribution
It introduces a Sigma model analysis of SU(3) breaking in multi-taste QCD and compares the outcomes of rooting Wilson versus staggered fermions.
Findings
Rooted Wilson fermions reproduce the physical spectrum.
Rooted staggered fermions leave spurious states due to extra symmetries.
Taste multiplicity varies with flavor in staggered approach.
Abstract
Using the Sigma model to explore the lowest order pseudo-scalar spectrum with SU(3) breaking, this talk considers an additional exact "taste" symmetry to mimic species doubling. Rooting replicas of a valid approach such as Wilson fermions reproduces the desired physical spectrum. In contrast, extra symmetries of the rooted staggered approach leave spurious states and a flavor dependent taste multiplicity.
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