Medium Effects in Kaon and Antikaon Production in Nuclear Collisions at Subthreshold Beam Energies

F. Laue; C. Sturm; I. Boettcher; M. Debowski; A. Foerster; E. Grosse; P. Koczon; B. Kohlmeyer; M. Mang; L. Naumann; H. Oeschler; F. Puehlhofer; E. Schwab; P. Senger; Y. Shin; J. Speer; H. Stroebele; G. Surowka; F. Uhlig; A. Wagner; W. Walus

doi:10.1103/physrevlett.82.1640

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Medium Effects in Kaon and Antikaon Production in Nuclear Collisions at Subthreshold Beam Energies

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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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F. Laue, C. Sturm, I. Boettcher, M. Debowski, A. Foerster, E. Grosse, P. Koczon, B. Kohlmeyer, M. Mang, L. Naumann, H. Oeschler, F. Puehlhofer, E. Schwab, P. Senger, Y. Shin, J. Speer, H. Stroebele, G. Surowka, F. Uhlig, A. Wagner, W. Walus. 1999-01-12. Medium Effects in Kaon and Antikaon Production in Nuclear Collisions at Subthreshold Beam Energies. https://doi.org/10.1103/physrevlett.82.1640

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