Excitation Function of K${}^{+}$ and ${\pi }^{+}$ Production in Au+Au Reactions at 2-10 AGeV

Abstract

Positive pion and kaon production from Au+Au reactions have been measured as a function of beam energy over the range 2.0-10.7~AGeV. Both the kaon and the pion production cross-sections at mid-rapidity are observed to increase steadily with beam kinetic energy. The ratio of K${}^{+}$ to ${\pi }^{+}$ mid-rapidity yields increases from 0.0271$\pm 0.0015\pm 0.0014$ at 2.0~AGeV to 0.202$\pm 0.005\pm 0.010$ at 10.7~AGeV and is larger than the K${}^{+}$/${\pi }^{+}$ ratio from p+p reactions over the same beam energy region. There is no indication of an onset of any new production mechanism in heavy-ion reactions in this energy range beyond rescattering of hadrons.

9 pages, 4 figures, submitted to Phys. Lett. B

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