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Title: Taste symmetry breaking with hypercubic-smeared staggered fermions

Abstract

We 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_equal}0.1 fm). In addition, we observe that discretization effects of next-to-leading order in the chiral expansion (O(a{sup 2}p{sup 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 O(a{sup 2}) effects. Our results suggest that, once one reaches a lattice spacing of a{approx_equal}0.09 fm, taste-breaking will be small enough after HYP smearing that one can use a modified power counting in which O(a{sup 2})<<O(p{sup 2}), simplify fitting to phenomenologically interesting quantities.

Authors:
; ; ; ; ;  [1];  [2];  [3]
  1. Frontier Physics Research Division and Center for Theoretical Physics, Department of Physics and Astronomy, Seoul National University, Seoul, 151-747 (Korea, Republic of)
  2. Physics Department, Brookhaven National Laboratory, Upton, New York 11973 (United States)
  3. Physics Department, University of Washington, Seattle, Washington 98195-1560 (United States)
Publication Date:
OSTI Identifier:
21250138
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 77; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.77.094508; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHIRALITY; EXPANSION; FERMIONS; PIONS; REDUCTION; SPECTRA; SYMMETRY BREAKING

Citation Formats

Bae, Taegil, Adams, David H., Kim, Hyung-Jin, Kim, Jongjeong, Kim, Kwangwoo, Lee, Weonjong, Jung, Chulwoo, and Sharpe, Stephen R. Taste symmetry breaking with hypercubic-smeared staggered fermions. United States: N. p., 2008. Web. doi:10.1103/PHYSREVD.77.094508.
Bae, Taegil, Adams, David H., Kim, Hyung-Jin, Kim, Jongjeong, Kim, Kwangwoo, Lee, Weonjong, Jung, Chulwoo, & Sharpe, Stephen R. Taste symmetry breaking with hypercubic-smeared staggered fermions. United States. doi:10.1103/PHYSREVD.77.094508.
Bae, Taegil, Adams, David H., Kim, Hyung-Jin, Kim, Jongjeong, Kim, Kwangwoo, Lee, Weonjong, Jung, Chulwoo, and Sharpe, Stephen R. Thu . "Taste symmetry breaking with hypercubic-smeared staggered fermions". United States. doi:10.1103/PHYSREVD.77.094508.
@article{osti_21250138,
title = {Taste symmetry breaking with hypercubic-smeared staggered fermions},
author = {Bae, Taegil and Adams, David H. and Kim, Hyung-Jin and Kim, Jongjeong and Kim, Kwangwoo and Lee, Weonjong and Jung, Chulwoo and Sharpe, Stephen R.},
abstractNote = {We 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_equal}0.1 fm). In addition, we observe that discretization effects of next-to-leading order in the chiral expansion (O(a{sup 2}p{sup 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 O(a{sup 2}) effects. Our results suggest that, once one reaches a lattice spacing of a{approx_equal}0.09 fm, taste-breaking will be small enough after HYP smearing that one can use a modified power counting in which O(a{sup 2})<<O(p{sup 2}), simplify fitting to phenomenologically interesting quantities.},
doi = {10.1103/PHYSREVD.77.094508},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 77,
place = {United States},
year = {Thu May 01 00:00:00 EDT 2008},
month = {Thu May 01 00:00:00 EDT 2008}
}