Measurements of triple- and double-spin parameters in elastic p-p scattering at 6 GeV/c.

Abstract

Toward the goal of experimentally determining the p-p elastic-scattering amplitudes at 6 GeV/c, we have measured a number of triple- and double-spin correlation parameters over the \ensuremath{\Vert}t\ensuremath{\Vert} range between 0.2 and 1.0 (GeV/c${)}^{2}$. These new data permit the first nucleon-nucleon amplitude determination in the multi-GeV energy range. Polarized beams from the Argonne Zero Gradient Synchrotron and polarized targets were utilized. The polarization of the recoil proton was measured with a carbon polarimeter. A total of 14 different spin observables were measured (five spin transfer, four depolarization, and five triple-spin correlation parameters). These have been combined with earlier results, resulting in a data set of typically 30 measurements of 20 different spin observables for each of six \ensuremath{\Vert}t\ensuremath{\Vert} values between 0.2 and 1.0 (GeV/c${)}^{2}$. A solution for the amplitudes has been found at each \ensuremath{\Vert}t\ensuremath{\Vert}, and comparisons are presented with several different models. The spin-nonflip helicity amplitudes are found to be much larger than the spin-flip amplitudes.