p¯pBackward Elastic Scattering from 0.7 to 2.16 GeV/c

Abstract

Elastic scattering of $\overline{p}$ on $p$ has been studied for ${cos\theta }_{\mathrm{c}.\mathrm{m}.\mathrm{}}$ between -0.88 and -1.0 and $P_{\mathrm{lab}}\left(\overline{p}\right)$ between 0.70 and 2.16 GeV/c. The momentum dependence of the cross section shows a sharp dip at 0.9 GeV/c and a broad peaking around 1.4 GeV/c. The possibility of the peak resulting from direct formation of boson resonances has been studied. Alternatively, a diffraction model agrees qualitatively with our data and other elastic data at different angles.