Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-02-05
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 7 figures, conference contribution for "International school of nuclear physics", Erice, Sicily, 16 - 24 September 20
Scientific paper
10.1016/j.ppnp.2008.12.020
The production of K+ and K- mesons below and at the NN threshold is summarized, based on a comparison of data with transport model calculations. K+ mesons are created in associate production together with hyperons (e.g. Lambda) in multi-step processes involving Delta resonances. These processes occur mainly during the high-density phase of the collision and this makes the K+ an ideal tool to extract the stiffness of the nuclear equation of state, found to be rather soft with a compressibility modulus K below 240 MeV. In contrast, the major part of K- mesons are produced via strangeness exchange. Most of the created K- are absorbed and the surviving ones are emitted quite late and at low densities.
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