%0 Journal Article
%A Hasan, Nesreen
%A Green, Jeremy
%A Meinel, Stefan
%A Engelhardt, Michael
%A Krieg, Stefan
%A Negele, John
%A Pochinsky, Andrew
%A Syritsyn, Sergey
%T Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass
%J Physical review / D
%V 99
%N 11
%@ 2470-0010
%C Melville, NY
%I Inst.812068
%M FZJ-2019-03706
%P 114505
%D 2019
%X 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000473023900003
%R 10.1103/PhysRevD.99.114505
%U https://juser.fz-juelich.de/record/863701