TY - JOUR
T1 - Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass
AU - Hasan, Nesreen
AU - Green, Jeremy
AU - Meinel, Stefan
AU - Engelhardt, Michael
AU - Krieg, Stefan
AU - Negele, John
AU - Pochinsky, Andrew
AU - Syritsyn, Sergey
N1 - Publisher Copyright:
© 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the «https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP.
PY - 2019/6/19
Y1 - 2019/6/19
N2 - 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≈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 scheme at scale 2 GeV. The tensor and axial charges have uncertainties of roughly 4%, gT=0.972(41) and gA=1.265(49). The resulting scalar charge, gS=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.
AB - 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≈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 scheme at scale 2 GeV. The tensor and axial charges have uncertainties of roughly 4%, gT=0.972(41) and gA=1.265(49). The resulting scalar charge, gS=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.
UR - https://www.scopus.com/pages/publications/85068610134
U2 - 10.1103/PhysRevD.99.114505
DO - 10.1103/PhysRevD.99.114505
M3 - Article
AN - SCOPUS:85068610134
SN - 2470-0010
VL - 99
JO - Physical Review D
JF - Physical Review D
IS - 11
M1 - 114505
ER -