Relativistic effects in the twonucleon system
Abstract
The Gross approximation to the BetheSalpeter equation is investigated using a onebosonexchange model for the nucleonnucleon interaction. In particular, it is shown that the inclusion of corrections from the twopion directbox diagram to the driving force in general does not yield phase shifts closer to those obtained from the BetheSalpeter equation. Moreover, the crossbox contributions lead in the quasipotential approach to a nonHermitian interaction at all energies. The electromagnetic form factors of the deuteron are calculated for various sets of potential parameters which give reasonable scattering parameters. A detailed analysis is presented of the relativistic and mesonic exchange current corrections to the nonrelativistic limit. As a result it is shown that the usual treatment of mesonic exchange currents for both pseudovector and pseudoscalar pionnucleon interaction is not correct since other nonnegligible contributions should be taken into account. [NUCLEAR STRUCTURE NN system, quasipotential equations compared with BetheSalpeter equations. Effect of oneloop diagrams. Electromagnetic form factors. Comment on mesonexchangecurrent calculations.]
 Publication:

Physical Review C
 Pub Date:
 August 1981
 DOI:
 10.1103/PhysRevC.24.736
 Bibcode:
 1981PhRvC..24..736Z