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Nucleon average quark momentum fraction with N f = 2 + 1 Wilson fermions

. We report on an analysis of the average quark momentum fraction of the nucleon and related quantities using N f = 2 + 1 Wilson fermions. Computations are performed on four CLS ensembles covering three values of the lattice spacing at pion masses down to M π ≈ 200MeV. Several source-sink separations ( ∼ 1 . 0fm to ∼ 1 . 4fm) 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.