First evidence for different freeze-out conditions for kaons and antikaons observed in heavy-ion collisions

A. Foerster, F. Uhlig, I. Boettcher +18

Differential production cross sections of K- and K+ mesons have been measured in Ni+Ni and Au+Au collisions at a beam energy of 1.5 AGeV. The K-/K+ ratio is found to be nearly cons…