TY  - JOUR
AU  - Hasan, Nesreen
AU  - Green, Jeremy
AU  - Meinel, Stefan
AU  - Engelhardt, Michael
AU  - Krieg, Stefan
AU  - Negele, John
AU  - Pochinsky, Andrew
AU  - Syritsyn, Sergey
TI  - Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass
JO  - Physical review / D
VL  - 99
IS  - 11
SN  - 2470-0010
CY  - Melville, NY
PB  - Inst.812068
M1  - FZJ-2019-03706
SP  - 114505
PY  - 2019
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 $a\approx$ 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-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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000473023900003
DO  - DOI:10.1103/PhysRevD.99.114505
UR  - https://juser.fz-juelich.de/record/863701
ER  -