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

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

1999-01-12

arxiv.org/abs/nucl-ex/9901005v1

Phys.Rev.Lett.82:1640-1643,1999

Physics

Nuclear Physics

Nuclear Experiment

Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.82.1640

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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