K−−pElastic Scattering in the1−BeVcRange

Abstract

Differential $K^{-}-p$ elastic-scattering cross sections have been measured at four momenta in the range corresponding to the $T=0\mathrm{}$, 1815-MeV $K^{-}-p$ resonance, using a cylindrical spark chamber surrounding a liquid-hydrogen target. The integrated elastic-scattering cross sections follow the known resonant behavior of the total cross section, and are (18.7±0.7), (23.3±1.0), (17.3±1.1), and (15.2±0.7) mb at 820, 1040, 1150, and 1260 $\frac{\mathrm{MeV}}{c}$ bombarding momentum, respectively. It is necessary to include ${cos}^5{\theta }^{*}$ terms in order to fit the angular distributions at 1040 and 1150 $\frac{\mathrm{MeV}}{c}$, and within the accuracy of the experiment higher terms in $cos{\theta }^{*}$ are not needed throughout the resonance region. This implies that the resonance is due to $D_{\frac{5}{2}}{F}_{\frac{5}{2}}$ interference, and that the simplest assignment for the spin of the resonance is $J=\frac{5}{2}$. No conclusion can be inferred about the parity.