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An excitation function of K- and K+ production in Au + Au reactions at the AGS.

The E866 & E917 collaborations Ahle, L ; Akiba, Y ; Ashktorab, K ; et al.

Phys.Lett.B 490 (2000) 53-60, 2000.

Inspire Record 531905 DOI 10.17182/hepdata.31473

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.

3 data tables

Table 1

Only statistical errors are presented.

Table 2

Only statistical errors are presented.

Table 3

Only statistical errors are presented.