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The total and differential cross sections for associated strangenessproduction in the $pp \to pK^+K^-p$ and $pp \to pK^+\pi^0\Sigma^0$ reactionshave been studied in a unified approach using an effective Lagrangian model. Itis assumed that both the $K^-p$ and $\pi^0\Sigma^0$ final states originate fromthe decay of the $\Lambda(1405)$ resonance which was formed in the productionchain $pp\to p(N^*(1535)\to K^+\Lambda(1405))$. The available experimental dataare well reproduced, especially the ratio of the two total cross sections,which is much less sensitive to the particular model of the entrance channel.The significant coupling of the $N^*(1535)$ resonance to $\Lambda(1405) K$ isfurther evidence for large $s \bar{s}$ components in the quark wave function ofthe $N^*(1535)$ resonance.

Associated strangeness production in the pp to pK^+K^-p and pp to pK^+ pi^0 Sigma^0 reactions