Production of cascade hyperons in hadron- and photon-induced reactions
Jackson, Benjamin Charles
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Towards a better understanding of multi-strangeness physics, various aspects of Ξ hyperon pro- duction are investigated in the reactions K ̄ +N → K+Ξ and γ+N → K+K+Ξ. First K ̄ + N → K + Ξ(Ξ∗) is treated in a model-independent manner and a minimum set of spin ob- servables is established that will determine the spin-parity of the produced Ξ(Ξ∗), two of the basic quantum numbers that specify a baryon. In addition, a calculation for all observables is done within a simple effective lagrangian model in an effort to learn about the reaction dynamics. Here S = −1 hyperon resonances contributions are reported which are important production mechanisms for Ξ baryons. The γ + N → K + K + Ξ reaction has a more complicated spin structure and we derive the most general spin structures consistent with basic symmetry principles. The effect of parity conservation on spin observables is investigated. A gauge-invariant model is described which is consistent with the calculation for the K ̄ + N → K + Ξ reaction.