K−dInteractions at 5.5 GeV/c:Σ∓π±π−(π0),Σ−K+K−, andK−K−pFinal States in Which a Hyperon is Produced

Abstract

The results presented in this paper are obtained from an analysis of bubble-chamber pictures of ${K}^{\ensuremath{-}}d$ interactions at an incident ${K}^{\ensuremath{-}}$ momentum of 5.5 GeV/c. Generally, the quasitwo-body final states are produced peripherally, with a small backward peak occurring in some of the final states. The final states ${\ensuremath{\Sigma}}^{\ensuremath{-}}\ensuremath{\omega}$, ${\ensuremath{\Sigma}}^{\ensuremath{-}}{\ensuremath{\rho}}^{0}$, and ${\ensuremath{\Sigma}}^{\ensuremath{-}}\ensuremath{\varphi}$ appear to be produced primarily by vector-meson exchange. In the final state $\ensuremath{\Lambda}(1520){\ensuremath{\pi}}^{\ensuremath{-}}$ the decay distributions of the $\ensuremath{\Lambda}(1520)$ hyperon are found to be consistent with a vector-exchagne production process with $M2$ coupling at the nucleon vertex. The predictions of the independent-quark model and of other symmetry schemes, namely that the forward cross sections for ${\ensuremath{\Sigma}}^{\ensuremath{-}}{\ensuremath{\rho}}^{0}$, ${\ensuremath{\Sigma}}^{\ensuremath{-}}\ensuremath{\omega}$, ${\ensuremath{\Sigma}}^{\ensuremath{-}}\ensuremath{\varphi}$ production be in the ratios 1: 1: 2, are not inconsistent with our experimental values.

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