We study the ability of a variety of fitting techniques to extract the ground state matrix elements of the vector current from ratios of nucleon three- and two-point functions that contain contaminations from excited states. Extending our high-statis
tics study of nucleon form factors, we are able to demonstrate that the treatment of excited-state contributions in conjunction with approaching the physical pion mass has a significant impact on the $Q^2$-dependence of the form factors.
The effects of unquenching on the perturbative improvement coefficients in the Symanzik action are computed within the framework of Luscher-Weisz on-shell improvement. We find that the effects of quark loops are surprisingly large, and their omission
may well explain the scaling violations observed in some unquenched studies.
The effects of unquenching on the perturbative improvement coefficients in the Symanzik action are computed within the framework of Luscher-Weisz on-shell improvement. We find that the effects of quark loops are surprisingly large, and their omission
may well explain the scaling violations observed in some unquenched studies.
