We have made the first measurement of the spin-spin correlation parameter $C_{\mathrm{SS}}$ in $\mathrm{pp}$ elastic scattering at 6 GeV/c over the $\mathrm{}\left|t\right|\mathrm{}$ range from 0.05 to 1.5 ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. The measured $C_{\mathrm{SS}}$ data points are all negative, and their absolute values increase with $\mathrm{}\left|t\right|\mathrm{}$. The results are compared with some existing attempts to describe the $\mathrm{pp}$ scattering process.

• Received 12 October 1976

DOI:https://doi.org/10.1103/PhysRevLett.37.1727