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HK: Hadronen und Kerne
HK 56: Postersitzung
HK 56.14: Poster
Wednesday, March 18, 1998, 17:00–19:00, Foyer
On isovector meson exchange currents in the Bethe-Salpeter approach — •M. Beyer1, S.G. Bondarenko2, V.V. Burov2, and S.M. Dorkin3 — 1Department of Physics, Rostock University, 18051 Rostock, Germany — 2Bogoliubov Laboratory of Theoretical Physics, JINR Dubna, 141980 Russia — 3Far Eastern State University Vladivostok, 690000 Russia
In recent years, the discussion of relativistic issues in the reactions involving the deuteron has become more and more important. Some well known examples for a clear experimental evidence have been found in the electromagnetic disintegration. 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 first 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.