An Excitation Function of K- and K+ Production in Au+Au Reactions at the AGS
Abstract
Mid-rapidity spectra and yields of K- and K+ have been measured for Au+Au collisions at 4, 6, 8, and 10.7 AGeV. The K- yield increases faster with beam energy than for K+ and hence the K-/K+ ratio increases with beam energy. This ratio is studied as a function of both s and s-sth which allows the direct comparison of the kaon yields with respect to the production threshold in p+p reactions. For equal s - sth the measured ratio K-/K+=0.2 at energies above threshold in contrast to the K-/K+ ratio of near unity observed at energies below threshold. The use of the K-/K+ ratio to test the predicted changes of kaon properties in dense nuclear matter is discussed.
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