Differential cross sections for elasticπ+pscattering between 1.2 and 2.3 GeV/c

Abstract

Differential cross sections for ${\pi }^{+}p$ elastic scattering in the momentum region 1.2 to 2.3 GeV/c are presented for the center-of-mass angular range $0.9>\mathrm{}cos\theta >-0.9\mathrm{}$. Typically, 50 000 events were obtained at each of 16 momenta using magnetostrictive-readout wire spark chambers to detect the particles scattered from a liquid hydrogen target. The results are compared to those of the CERN-71 phase-shift analysis. The well-known dips at $t\cong -0.7\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ and at $u^{\prime }=-0.2\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$ are observed. In addition, structure is seen at constant $u^{\prime }=-1.3\mathrm{}$ ${(\mathrm{G}\mathrm{e}\mathrm{V}/\mathit{c})}^2$. The results of a pion attenuation study in iron are also presented.