Relativistic structure of the deuteron: Electrodisintegration and y scaling - art. no. 034003

Realistic solutions of the spinor-spinor Bethe-Salpeter equation for the de uteron with the realistic interaction kernel, including the exchange of pi, sigma, omega, rho, eta, and delta mesons, are used to systematically inves tigate relativistic effects in inclusive quasielastic electran-deuteron sca ttering within the relativistic impulse approximation. Relativistic gamma s caling is considered by generalizing the nonrelativistic scaling function t o the relativistic case, and it is shown that gamma scaling does occur in t he usual relativistic scaling variable resulting from the energy conservati on in the instant form of dynamics. The present approach of gamma scaling i s fully covariant. with the deuteron being described by eight components, v iz. the S-3(1)++, S-3(1)--, D-3(1)++, D-3(1)--, P-3(1)+-, P-3(1)-+, P-1(1)-, P-1(1)-+ waves. It is demonstrated that if the negative relative energy states P-1(1), P-3(1) are disregarded, the concept of covariant momentum di stributions N(p(0),P) with p(0) = M-D/2- root p(2)+m(2), can be introduced, and that calculations of electrodisintegration cross section in terms of t hese distributions agree within a few percent with the exact calculations, which include the 1P1 and 3P1 states, provided the nucleon three momentum \ p\ less than or equal to 1 GeV/c; in this momentum range, the asymptotic re lativistic scaling function is shown to coincide with the longitudinal cova riant momentum distribution. [S0556-2813(99)03708-5].