The studies of hyperon production performed at COSY-11 are summarized. The results of the experiments in the reaction channels pp → pK+Λ, pp → pK+Σ0, and pp → nK+Σ+ are shown. Excitation functions from threshold up to about 90 MeV excess energies have been evaluated with high precision for the Λ and Σ0 production. The Λp and Σ0 p final state interactions were extracted. The Σ+ production was me...

Bresar in 1993 proved that each biderivation on a noncommutative prime ring is a multiple of a commutatot. A result of it is a characterization of commuting additive mappings, because each commuting additive map give rise to a biderivation. Then in 1995, he investigated biderivations, generalized biderivations and sigma-biderivations on a prime ring and generalized the results of derivations fo...

The QCD counterpart of Hawking radiation from black holes leads to thermal hadron production in high energy collisions, from e+e− annihilation to heavy ion interactions. This hadronic radiation is formed by tunnelling through the event horizon of colour confinement and is emitted at a universal temperature TH ≃ (σ/2π)1/2, where σ denotes the string tension. Since the event horizon does not allo...

The reactions pn → dω and pn → dφ are studied within a relativistic meson-exchange model of hadronic interactions. Predictions for the total cross sections and for the angular distributions of the vector mesons are presented. The resulting cross sections near threshold are around 10-30 µb for pn → dω and 200-250 nb for pn → dφ. A moderate deviation of the cross section ratio σ pn→dφ /σ pn→dω fr...