Electromagnetic Currents and the Blankenbecler-Sugar Equation

Details Electromagnetic Currents and the Blankenbecler-Sugar Equation Electromagnetic Currents and the Blankenbecler-Sugar Equation

1993-09-24

arxiv.org/abs/nucl-th/9309026v1

Physics

Nuclear Physics

Nuclear Theory

26 pages, ANL-PHY-7596-93, LaTeX

Scientific paper

10.1006/aphy.1994.1076

The effective electromagnetic current density for a two-nucleon system that is described by the Blankenbecler-Sugar equation is derived. In addition to the single nucleon currents there are exchange currents of two different origins. The first is the exchange current that is required to compensate for the violation of the continuity equation in the impulse approximation. The second is an exchange current, which arises in the quasipotential reduction from the Bethe-Salpeter equation, and which represents effects of suppressed degrees of freedom. Explicit general expressions are given for both of these exchange currents. The results are applicable to both elastic and inelastic processes.

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