Journal
PHYSICAL REVIEW D
Volume 99, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.99.114505
Keywords
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Funding
- U.S. Department of Energy (DOE), Office of Science, Office of High Energy Physics [DE-SC0009913]
- RIKEN BNL Research Center
- Office of Nuclear Physics of the U.S. Department of Energy (DOE) [DE-FG02-96ER40965, DE-SC-0011090, DE-FC02-06ER41444]
- Deutsche Forschungsgemeinschaft [SFB-TRR 55]
- University of Arizona
- Stony Brook University
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We report on lattice QCD calculations of the nucleon isovector axial, scalar, and tensor charges. Our calculations are performed on two 2 + 1-flavor ensembles generated using a 2-HEX-smeared Wilson-clover action at the physical pion mass and lattice spacings a approximate to 0.116 and 0.093 fm. We use a wide range of source-sink separations-eight values ranging from roughly 0.4 to 1.4 fm on the coarse ensemble and three values from 0.9 to 1.5 fm on the fine ensemble-which allows us to perform an extensive study of excited-state effects using different analysis and fit strategies. To determine the renormalization factors, we use the nonperturbative Rome-Southampton approach and compare RI'-MOM and RI-SMOM intermediate schemes to estimate the systematic uncertainties. Our final results are computed in the (MS) over bar scheme at scale 2 GeV. The tensor and axial charges have uncertainties of roughly 4%, g(T) = 0.972(41) and g(A) = 1.265(49). The resulting scalar charge, g(S) = 0.927(303), has a much larger uncertainty due to a stronger dependence on the choice of intermediate renormalization scheme and on the lattice spacing.
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