The WJC2 covariant spectator model reproduces electron-deuteron elastic scattering up to Q about 1.4 GeV by fitting two off-shell nucleon form factors and then extrapolating the neutron charge form factor to higher momentum transfer.
The polarization vectors satisfy the well known constraints P+·ξλ =P−·ξ′ λ′ = 0 ξ∗ λ·ξρ =−δλρ ξ′∗ λ′·ξ′ ρ′ =−δλ′ρ′
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Covariant Spectator Theory of $np$ scattering: Deuteron form factors
The WJC2 covariant spectator model reproduces electron-deuteron elastic scattering up to Q about 1.4 GeV by fitting two off-shell nucleon form factors and then extrapolating the neutron charge form factor to higher momentum transfer.