Year: 2005
Type: article
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 with a dynamical boost for two-body systems with spin. We first compute form factors in impulse approximation, but then also add an isoscalar meson-exchange current of pion range that involves the $\ensuremath{\gamma}\ensuremath{\pi}$ contact operator associated with pseudovector $\ensuremath{\pi}N$ coupling. We also consider effects of the $\ensuremath{\rho}\ensuremath{\pi}\ensuremath{\gamma}$ meson-exchange current. The experimentally measured quantities $A,B$, and ${t}_{20}$ are calculated over the kinematic range probed in recent Jefferson Laboratory experiments. The $\ensuremath{\rho}\ensuremath{\pi}\ensuremath{\gamma}$ meson-exchange current provides significant strength in A at large ${Q}^{2}$ and the $\ensuremath{\gamma}\ensuremath{\pi}$ contact-term exchange current shifts ${t}_{20}$, providing good agreement with the data from the Thomas Jefferson National Accelerator Facility. Relativistic effects and the $\ensuremath{\gamma}\ensuremath{\pi}$ meson-exchange current do not provide an explanation of the B observable, but the $\ensuremath{\rho}\ensuremath{\pi}\ensuremath{\gamma}$ current could help to provide agreement if a nonstandard value is used for the tensor $\ensuremath{\rho}N$ coupling that enters this contribution.
Source: Physical Review C
Authors: D. R. Phillips, S. J. Wallace, N. K. Devine
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2021565624