K+pInteractions at 2 BeV/c—Elastic Scattering and Total Cross Sections

Study of 1.96-BeV/c $K^{+}p$ interactions in the Brookhaven 20-in. liquid-hydrogen bubble chamber has yielded a measurement of the elastic-scattering cross section $\sigma =7.5\mathrm{}\pm 0.7$ mb. A fit to the differential cross section versus momentum transfer of the form ${\sigma }_0{e}^{-\alpha t}$ gives, for the interval $0.01 {\left(\frac{\mathrm{BeV}}{c}\right)}^2<t<\mathrm{}0.60\mathrm{} {\left(\frac{\mathrm{BeV}}{c}\right)}^2$, $\alpha =3.1\mathrm{}\pm 0.3$ ${(\mathrm{B}\mathrm{e}\mathrm{V}/\mathit{c})}^{-2\mathrm{}}$, and ${\sigma }_0=4.8\mathrm{}\pm 0.5$ mb/sr. The total cross section obtained is 19.4±2.0 mb with single-pion production dominant.