An Excitation Function of K$^-$ and K$^+$ Production in Au+Au Reactions at the AGS

Details An Excitation Function of K$^-$ and K$^+$ Production in Au+Au Reactions at the AGS An Excitation Function of K$^-$ and K$^+$ Production in Au+Au Reactions at the AGS

2000-08-17

arxiv.org/abs/nucl-ex/0008010v1

Phys.Lett.B490:53-60,2000

Physics

Nuclear Physics

Nuclear Experiment

5 figures

Scientific paper

10.1016/S0370-2693(00)00916-3

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 $\sqrt{s}$ and $\sqrt{s}$-$\sqrt{s_{th}}$ which allows the direct comparison of the kaon yields with respect to the production threshold in p+p reactions. For equal $\sqrt{s}$ - $\sqrt{s_{th}}$ 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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