Nucleon electromagnetic form factors in twisted mass lattice QCD

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 $L=2.1\mathrm{fm}$ and $L=2.8\mathrm{fm}$. Cutoff effects are investigated using three different values of the lattice spacings, namely $a=0.089\mathrm{fm}$, $a=0.070\mathrm{fm}$ and $a=0.056\mathrm{fm}$. 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. DOI: http://dx.doi.org/10.1103/PhysRevD.83.094502 © 2011 American Physical Society