Phi meson production cross sections in pion-baryon and baryon-baryon interactions

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Phi meson production in pion-baryon and baryon-baryon interactions near the production threshold is studied in a boson-exchange model. Parameters in this model are either taken from the Bonn model for the nucleon-nucleon potential or determined from the measured phi meson decay width and the experimental data for the reactions π-p ϕn and pp ppϕ. The isospin-averaged cross sections for the reactions πN ϕN, πΔ ϕN, NN NNϕ, which are needed in transport models to study phi meson production in heavy-ion collisions at subthreshold energies, have been evaluated. For the reactions NΔ NNϕ and ΔΔ NNϕ, which become singular when the exchanged pion is on-shell, the Peierls method is used to calculate their cross sections. We find that the cross section for the reaction πNϕN is much larger than the other cross sections.