On isovector meson exchange currents in the Bethe-Salpeter approach

Details On isovector meson exchange currents in the Bethe-Salpeter approach On isovector meson exchange currents in the Bethe-Salpeter approach

1998-09-12

arxiv.org/abs/nucl-th/9809037v1

Phys.Rev.C58:3143-3152,1998

Physics

Nuclear Physics

Nuclear Theory

15 pages, incl. 3 figures, to be published Phys. Rev. C

Scientific paper

10.1103/PhysRevC.58.3143

We investigate the nonrelativistic reduction of the Bethe-Salpeter amplitude for the deuteron electrodisintegration near threshold energies. To this end, two assumptions have been used in the calculations: 1) the static approximation and 2) the one iteration approximation. Within these assumptions it is possible to recover the nonrelativistic result including a systematic extension to relativistic corrections. We find that the so-called pair current term can be constructed from the $P$-wave contribution of the deuteron Bethe-Salpeter amplitude. The form factor that enters into the calculation of the pair current is constrained by the manifestly gauge independent matrix elements.

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