Measurement of Analyzing Power for Proton-Carbon Elastic Scattering in the Coulomb-Nuclear Interference Region with a 22-GeV/c Polarized Proton Beam

Abstract

The analyzing power for proton-carbon elastic scattering in the coulomb-nuclear interference region of momentum transfer, $9.0\times 10^{-3}<-t<4.1\times 10^{-2}$ (GeV/$c{)}^2$, was measured with a 21.7 GeV/$c$ polarized proton beam at the Alternating Gradient Synchrotron of Brookhaven National Laboratory. The ratio of hadronic spin-flip to non-flip amplitude, $r_5$, was obtained from the analyzing power to be $\text{Re}{r}_5=0.088\pm 0.058$ and $\text{Im}{r}_5=-0.161\pm 0.226$.

4 pages, 4 figures and 1 table. Accepted by Physical Review Letters