⊖⁺ baryon production in KN and NN reactions

We study ⊖⁺ (1540) production in kaon-nucleon (KN) and nucleon-nucleon (NN) interactions by assuming that the ⊖⁺ is an isosinglet with J^P= 1/2⁺. Possible t-channel diagrams with K* exchange are considered in both reactions as well as K exchange in NN reactions. The cross section for np→ Λ⁰⊖ ⁺, which has not been considered in previous calculations, is found to be about a factor of 5 larger than that for np→∑⁰⊖ ⁺ due to the large coupling of the KNΛ interaction. The cross sections are obtained by setting g_KN⊖ = 1 and varying the ratio of g_K*N⊖/g_KN⊖ so that future experimental data can be used to estimate these couplings. We also find that the isospin relations hold for these reactions.