Elastic Scattering and Single-Pion Production inK−pInteractions at 5.5GeVc

Abstract

We present results of an analysis of two-prong events for elastic scattering and single-pion production in ${K}^{\ensuremath{-}}p$ interactions at 5.5 $\frac{\mathrm{GeV}}{c}$. The resonance parameters for the charged and neutral ${K}^{*}(890)$ and ${K}^{*}(1420)$ are determined and the observed production and decay properties of the charged and neutral ${K}^{*}(890)$ are compared with the theoretical predictions of an absorptive one-particle-exchange model and a Regge model. The ${K}^{*}(1420)$ differential cross section and density-matrix elements are presented and the question of whether more than one resonance exists in this mass range is considered. A search for resonance effects at $K\ensuremath{\pi}$ mass beyond 1500 MeV is made. In particular, the recently reported state at 1800 MeV is discussed. A ${B}_{5}$-model analysis of the reaction ${K}^{\ensuremath{-}}p\ensuremath{\rightarrow}{\overline{K}}^{0}{\ensuremath{\pi}}^{\ensuremath{-}}p$ is also presented.