https://doi.org/10.1051/epjconf/201817506033
Nucleon Axial and Electromagnetic Form Factors
1
Theoretical Division T-2, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
2
Computer, Computational, and Statistical Sciences CCS-7, Los Alamos National Laboratory, Los Alamos, NM 87545, U.S.A.
3
Department of Physics and Astronomy, Michigan State University, MI 48824, U.S.A
* Speaker. e-mail: ypj@bnl.gov. Present: Physics Department, Brookhaven National Laboratory, Upton, NY 11973, USA.
Published online: 26 March 2018
We present results for the isovector axial, induced pseudoscalar, electric, and magnetic form factors of the nucleon. The calculations were done using 2 + 1 + 1-flavor HISQ ensembles generated by the MILC collaboration with lattice spacings a ≈ 0.12, 0.09, 0.06 fm and pion masses Mπ ≈ 310, 220, 130 MeV. Excited-states contamination is controlled by using four-state fits to two-point correlators and by comparing two-versus three-states in three-point correlators. The Q2 behavior is analyzed using the model independent z-expansion and the dipole ansatz. Final results for the charge radii and magnetic moment are obtained using a simultaneous fit in Mπ, lattice spacing a and finite volume.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
