Nucleon charges and quark momentum fraction with N_f=2+1 Wilson fermions

2018/09/27 by Ottnad, Konstantin, Harris, Tim, Meyer, Harvey +3
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat)

paper · doi:10.48550/arxiv.1809.10638

Abstract

We present a nucleon structure analysis including local isovector charges as well as twist-2 operator insertions. Computations are performed on CLS ensembles with N_f=2+1 Wilson fermions, covering four values of the lattice spacing and pion masses down to M_π≈ 200 MeV. Several source-sink separations (typically ∼ 1.0 fm to ∼ 1.5 fm) allow us to assess excited-state contaminations. Results on each ensemble are obtained from simultaneous two-state fits including all observables and all available source-sink separations with the mass gap as a free fit parameter. Finally, the chiral, continuum and finite size extrapolation is performed to extract physical results.

Related

• Improved analysis of nucleon isovector charges and twist-2 matrix elements on CLS N_f=2+1 ensembles
• Nucleon form factors and couplings with N_\f = 2 + 1 Wilson\n fermions
• Mass and isovector matrix elements of the nucleon at zero-momentum transfer
• Nucleon electromagnetic form factors and axial charge from CLS N_f=2+1 ensembles
• Strange nucleon form factors with N_f = 2 + 1 O(a)-improved Wilson\n fermions