We describe a lattice approach for directly computing momentum derivatives of nucleon matrix elements using the Rome method, which we apply to obtain the isovector magnetic moment and Dirac radius. We present preliminary results calculated at the physical pion mass using a 2HEX-smeared Wilson-clover action. For removing the effects of excited-state contamination, the calculations were done at three source-sink separations and the summation method was used.
Cite
@article{arxiv.1611.01383,
title = {Computing the nucleon Dirac radius directly at $Q^2=0$},
author = {Nesreen Hasan and Michael Engelhardt and Jeremy Green and Stefan Krieg and Stefan Meinel and John Negele and Andrew Pochinsky and Sergey Syritsyn},
journal= {arXiv preprint arXiv:1611.01383},
year = {2016}
}
Comments
7 pages, 2 figures, presented at 34th annual International Symposium on Lattice Field Theory (Lattice 2016), 24-30 July 2016, Southampton, UK