This title appears in the Scientific Report :
2019
Please use the identifier:
http://hdl.handle.net/2128/22470 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevD.99.114505 in citations.
Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass
Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass
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 wid...
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Personal Name(s): | Hasan, Nesreen |
---|---|
Green, Jeremy / Meinel, Stefan / Engelhardt, Michael / Krieg, Stefan (Corresponding author) / Negele, John / Pochinsky, Andrew / Syritsyn, Sergey | |
Contributing Institute: |
John von Neumann - Institut für Computing; NIC Jülich Supercomputing Center; JSC |
Published in: | Physical Review D Physical review / D, 99 99 (2019 2019) 11 11, S. 114505 114505 |
Imprint: |
Melville, NY
Inst.812068
2019
2019-06-19 2019-06-01 |
DOI: |
10.1103/PhysRevD.99.114505 |
Document Type: |
Journal Article |
Research Program: |
The Proton radius and other aspects of nucleon structure from Lattice QCD Computational Science and Mathematical Methods |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevD.99.114505 in citations.
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. |