Nucleon average quark momentum fraction with Nf = 2+1 Wilson fermions
PRISMA Cluster of Excellence and Institut für Kernphysik, Johann-Joachim-Becher-Weg 45, University of Mainz,, 55099 Mainz, Germany
2 Helmholtz Institute Mainz, University of Mainz, 55099 Mainz, Germany
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Published online: 26 March 2018
We report on an analysis of the average quark momentum fraction of the nucleon and related quantities using Nf = 2 + 1 Wilson fermions. Computations are performed on four CLS ensembles covering three values of the lattice spacing at pion masses down to Mπ ≈ 200 MeV. Several source-sink separations (~ 1:0 fm to ~ 1:4 fm) are used to assess the excited-state contamination. To gain further insight, the generalized pencil-of-functions approach has been implemented to reduce the excited-state contamination in the relevant two-and three-point functions. Preliminary results are shown for the isovector nucleon charges from vector, axial vector and tensor derivative (twist-2) operators.
© The Authors, published by EDP Sciences, 2018
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