Nucleon Axial and Electromagnetic Form Factors
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: email@example.com. 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
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