Nucleon-nucleon elastic scattering to 3 GeV

Abstract

A partial-wave analysis (PWA) of $\mathrm{NN}$ elastic scattering data has been completed. This analysis covers an expanded energy range, from threshold to a laboratory kinetic energy of 3 GeV, in order to include recent elastic $\mathrm{pp}$ polarized scattering measurements performed at SATURNE II. Results of the energy-dependent fit are compared with single-energy solutions and Saclay amplitudes obtained via the direct-reconstruction approach. We also comment on the status of ${\ensuremath{\epsilon}}_{1}$ in the low-energy region.