Measurements of two- and three-spin parameters at 6 GeV/<i>c</i>using a transversely polarized beam and target

Abstract

Toward the goal of experimentally determining $\mathrm{pp}$ elastic scattering amplitudes at 6 GeV/c, we have measured a linear combination of triple-spin correlation parameters and also a linear combination of spintransfer parameters over the $|t|$ range between 0.2 and 1.0 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^{2}$. A horizontally polarized beam ($S$ direction) was obtained by precessing the spin of the polarized beam from the Argonne Zero Gradient Synchrotron using a superconducting solenoid. The target protons were polarized vertically ($N$ direction) and the polarization of the recoil protons was measured with a carbon polarimeter. The results are consistent with the amplitude corresponding to $\ensuremath{\pi}$ exchange being almost real and positive.