Taste symmetry breaking with HYP-smeared staggered fermions

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dc.creatorBae, Taegil
dc.creatorAdams, David H.
dc.creatorJung, Chulwoo
dc.creatorKim, Hyung-Jin
dc.creatorKim, Jongjeong
dc.creatorKim, Kwangwoo
dc.creatorLee, Weonjong
dc.creatorSharpe, Stephen R.
dc.date2008-01-19
dc.date2008-05-24
dc.date.accessioned2026-07-07T11:55:23Z
dc.date.available2026-07-07T11:55:23Z
dc.descriptionWe study the impact of hypercubic (HYP) smearing on the size of taste breaking for staggered fermions, comparing to unimproved and to asqtad-improved staggered fermions. As in previous studies, we find a substantial reduction in taste-breaking compared to unimproved staggered fermions (by a factor of 4-7 on lattices with spacing $a\approx 0.1 $fm). In addition, we observe that discretization effects of next-to-leading order in the chiral expansion (${\cal O}(a^2 p^2)$) are markedly reduced by HYP smearing. Compared to asqtad valence fermions, we find that taste-breaking in the pion spectrum is reduced by a factor of 2.5-3, down to a level comparable to the expected size of generic ${\cal O}(a^2)$ effects. Our results suggest that, once one reaches a lattice spacing of $a\approx 0.09 $fm, taste-breaking will be small enough after HYP smearing that one can use a modified power counting in which ${\cal O}(a^2) \ll {\cal O}(p^2)$, simplify fitting to phenomenologically interesting quantities.
dc.description14 pages, 13 figures, references updated, minor changes
dc.identifierhttps://arxiv.org/abs/0801.3000
dc.identifierhttp://arxiv.org/abs/0801.3000
dc.identifierPhys.Rev.D77:094508,2008
dc.identifierdoi:10.1103/PhysRevD.77.094508
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/205223
dc.subjectHigh Energy Physics - Lattice
dc.titleTaste symmetry breaking with HYP-smeared staggered fermions
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