The weak production of Lambdas in nucleon-nucleon scattering is studied in a meson-exchange framework. The weak transition operator for the NN → NΛ reaction is identical to a previously developed weak strangeness-changing transition potential ΛN → NN that describes the nonmesonic decay of hypernuclei. The initial NN and final Y N state interaction has been included by using realistic baryon-bar...

We first review the production and the possible chemical equilibration of strange particles at CERN-SPS energies within a microscopic hadronic transport calculation. It is shown in particular that the strange quarks are produced initially via string excitations in the primary, secondary and ternary interactions. We then further elaborate on a recent idea of antihyperon production by multi-meson...

We present an analysis of particle production yields measured in central Au-Au collisions at RHIC in the framework of the statistical thermal model. We demonstrate that the model extrapolated from previous analyses at SPS and AGS energy is in good agreement with the available experimental data at √ s = 130 GeV implying a high degree of chemical equilibration. Performing a χ fit to the data, the...

We present an analysis of particle production yields measured in central Au–Au collisions at RHIC in the framework of the statistical thermal model. We demonstrate that the model extrapolated from previous analyses at SPS and AGS energy is in good agreement with the available experimental data at √ s = 130 GeV implying a high degree of chemical equilibration. Performing a χ2 fit to the data, th...