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PoS(LATTICE2016)167

Nucleon form factors and couplings with $N_{\mathrm f}=2+1$ Wilson fermions

T. Harris, D. Djukanovic, G. von Hippel, P. Junnarkar, H.B. Meyer, H. Wittig

in 34th annual International Symposium on Lattice Field Theory

Contribution: pdf

Abstract

We present updated results on the nucleon electromagnetic form factors and axial coupling calcu- lated using CLS ensembles with $N_\mathrm{f}=2+1$ dynamical flavours of Wilson fermions. The measure- ments are performed on large, fine lattices with a pseudoscalar mass reaching down to 200 MeV. The truncated-solver method is employed to reduce the variance of the measurements. Estimation of the matrix elements is challenging due to large contamination from excited states and further investigation is necessary to bring these effects under control.