Isoscalar electromagnetic form factors of the nucleon in $N_{\mathrm{f}}=2+1$ lattice QCD

Abstract

We present results for the isoscalar electromagnetic form factors of the nucleon computed on the Coordinated Lattice Simulations (CLS) ensembles with $N_{\mathrm{f}}=2+1$ flavors of $\mathcal{O}(a)$-improved Wilson fermions and an $\mathcal{O}(a)$-improved conserved vector current. In order to estimate the excited-state contamination, we employ several source-sink separations and apply the summation method. For the computation of the quark-disconnected diagrams, a stochastic estimation based on the one-end trick is performed, in combination with a frequency-splitting technique and the hopping parameter expansion. By these means, we obtain a clear signal for the form factors including the quark-disconnected contributions, which have a statistically significant effect on our results.

9 pages, 5 figures, contribution to the 38th International Symposium on Lattice Field Theory (LATTICE21), 26th-30th July 2021, Zoom/Gather@Massachusetts Institute of Technology; enlarged font size in figures

References in corpus (3)

• Simulation of QCD with N_f=2+1 flavors of non-perturbatively improved Wilson fermions
• Isovector electromagnetic form factors of the nucleon from lattice QCD and the proton radius puzzle
• Model-independent determination of the nucleon charge radius from lattice QCD

Cited by in corpus (1)

• Electromagnetic form factors of the proton and neutron from $N_f=2+1$ lattice QCD