Medium Effects in Kaon and Antikaon Production in Nuclear Collisions at Subthreshold Beam Energies
Abstract
Production cross sections of K+ and K- mesons have been measured in C+C collisions at beam energies per nucleon below and near the nucleon-nucleon threshold. At a given beam energy, the spectral slopes of the K- mesons are significantly steeper than the ones of the K+ mesons. The excitation functions for K+ and K- mesons nearly coincide when correcting for the threshold energy. In contrast, the K+ yield exceeds the K- yield by a factor of about 100 in proton-proton collisions at beam energies near the respective nucleon-nucleon thresholds.
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