Journal Article

FZJ-2019-03706

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nucleon axial, scalar, and tensor charges using lattice QCD at the physical pion mass

Hasan, N.FZJ* ; Green, J. ; Meinel, S. ; Engelhardt, M. ; Krieg, S. (Corresponding author)FZJ* ; Negele, J. ; Pochinsky, A. ; Syritsyn, S.

2019
Inst.812068 Melville, NY

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Please use a persistent id in citations: http://hdl.handle.net/2128/22470  doi:10.1103/PhysRevD.99.114505

Abstract: 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.

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Contributing Institute(s):

1. Jülich Supercomputing Center (JSC)
2. John von Neumann - Institut für Computing (NIC)

Research Program(s):

1. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)
2. The Proton radius and other aspects of nucleon structure from Lattice QCD (hmz37_20161101) (hmz37_20161101)

Appears in the scientific report 2019

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Database coverage:
; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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