Electron-deuteron scattering in the equal-time formalism: beyond the impulse approximation

Abstract

Using a three-dimensional formalism that includes relativistic kinematics, the effects of negative-energy states, approximate boosts of the two-body system, and current conservation, we calculate the electromagnetic form factors of the deuteron up to Q^2 of 4 GeV^2. This is done using a dynamical boost for two-body systems with spin. We first compute form factors in impulse approxmation, but then also add an isoscalar meson-exchange current of pion range that involves the gamma-pi contact operator associated with pseudovector pi-N coupling. We also consider effects of the rho-pi-gamma meson-exchange current. The experimentally measured quantities A, B, and t20 are calculated over the kinematic range probed in recent Jefferson Laboratory experiments. The rho-pi-gamma meson-exchange current provides significant strength in A at large Q^2 and the gamma-pi contact-term exchange current shifts t20, providing good agreement with the JLab data. Relativistic effects and the gamma-pi meson-exchange current do not provide an explanation of the B observable, but the rho-pi-gamma current could help to provide agreement if a nonstandard value is used for the tensor rho-N coupling that enters this contribution.

15 pages, 10 figures. (v2) Added references on rho-pi-gamma current as well as comparison to recent Novosibirsk data on T20. Implemented \includegraphics in place of \BoxedEPSF. (v3) Modified in order to clarify the nature of the boost we implemented for particles with spin. Other minor changes. Version to be published in Physical Review C

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Cited by in corpus (12)

• Transition between nuclear and quark-gluon descriptions of hadrons and light nuclei
• Chiral effective theory predictions for deuteron form factor ratios at low Q^2
• First Order Relativistic Three-Body Scattering
• Isoscalar short-range current in the deuteron induced by an intermediate dibaryon
• The role of the pion pair term in the theory of the weak axial meson exchange currents
• Exchange current contributions in null-plane quantum models of elastic electron deuteron scattering
• Gauge invariance in the presence of a cutoff
• Asymptotics of the deuteron form factors in the nucleon model and JLab experiments
• Pion reactions on two--nucleon systems
• Asymptotic of the electric structure function and the deuteron wave function
• Non-Strange Meson Production with Hadronic Probes
• The piNN system - recent progress