Nucleon electromagnetic form factors in twisted mass lattice QCD

TL;DR

This paper computes nucleon electromagnetic form factors using twisted mass lattice QCD, analyzing volume and cut-off effects, and extrapolating results to compare with experimental data.

Contribution

It provides a detailed lattice QCD study of nucleon form factors with multiple volumes and lattice spacings, including continuum and chiral extrapolations.

Findings

Results are consistent with experimental measurements.

Volume and lattice spacing effects are systematically analyzed.

Form factors are successfully extrapolated to the physical point.

Abstract

We present results on the nucleon electromagnetic form factors within lattice QCD using two flavors of degenerate twisted mass fermions. Volume effects are examined using simulations at two volumes of spatial length L=2.1 fm and L=2.8 fm. Cut-off effects are investigated using three different values of the lattice spacings, namely a=0.089 fm, a=0.070 and a=0.056 fm. The nucleon magnetic moment, Dirac and Pauli radii are obtained in the continuum limit and chirally extrapolated to the physical pion mass allowing for a comparison with experiment.