Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2000-10-23
Phys.Lett.B495:26-32,2000
Physics
Nuclear Physics
Nuclear Experiment
16 pages, 3 figures, accepted for publication in Physics Letters B
Scientific paper
10.1016/S0370-2693(00)01232-6
Differential production cross sections of K$^-$ and K$^+$ mesons have been measured as function of the polar emission angle in Ni+Ni collisions at a beam energy of 1.93 AGeV. In near-central collisions, the spectral shapes and the widths of the rapidity distributions of K$^-$ and K$^+$ mesons are in agreement with the assumption of isotropic emission. In non-central collisions, the K$^-$ and K$^+$ rapidity distributions are broader than expected for a single thermal source. In this case, the polar angle distributions are strongly forward-backward peaked and the nonisotropic contribution to the total yield is about one third both for K$^+$ and K$^-$ mesons. The K$^-$/K$^+$ ratio is found to be about 0.03 independent of the centrality of the reaction. This value is significantly larger than predicted by microscopic transport calculations if in-medium modifications of K mesons are neglected.
Boettcher Igor
Debowski M.
Dohrmann F.
Foerster Angela
Grosse Eckart
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