l - th / 9 70 60 18 v 1 5 J un 1 99 7 Spin - Polarization Response Functions in High - Energy ( − → e , e ′ − → p ) Reactions

Spin-polarization response functions are examined for high-energy (−→e , e′−→p ) reaction by computing the full 18 response functions for the proton kinetic energy Tp′ = 0.515 GeV and 3.179 GeV with an 16O target. The Dirac eikonal formalism is applied to account for the final-state interactions. The formalism is found to yield the response functions in good agreement with those calculated by the partial-wave expansion method at 0.515 GeV. We identify the response functions that depend on the spin-orbital potential in the final-state interactions, but not on the central potential. Dependence on the Diracor Pauli-type current of the nucleon is investigated in the helicitydependent response functions, and the normal-component polarization of the knocked-out proton, Pn, is computed. Also Department of Physics, the George Washington University, Washington, DC 20052 Also Department of Physics and Astronomy, California State University, Northridge, Northridge,