ANALYZING POWER MEASUREMENT OF PP ELASTIC-SCATTERING IN THE COULOMB-NUCLEAR INTERFERENCE REGION WITH THE 200-GEV/C POLARIZED-PROTON BEAM AT FERMILAB

The analyzing power A(N) Of proton-proton elastic scattering in the Coulomb-nuclear interference region has been measured using the 200-GeV/c Fermilab polarized proton beam. A theoretically predicted interference between the hadronic non-spin-flip amplitude and the electromagnetic spin-flip amplitude is shown for the first time to be present at high energies in the region of 1.5 X 10(-3) to 5.0 X 10(-2) (GeV/c)2 four-momentum transfer squared, and our results are analyzed in connection with theoretical calculations. In addition, the role of possible contributions of the hadronic spin-flip amplitude is discussed.