First Measurement of Antikaon Phase-Space Distributions in Nucleus-Nucleus Collisions at Subthreshold Beam Energies

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dc.creatorMenzel, M.
dc.creatorBoettcher, I.
dc.creatorDebowski, M.
dc.creatorDohrmann, F.
dc.creatorFoerster, A.
dc.creatorGrosse, E.
dc.creatorKoczon, P.
dc.creatorKohlmeyer, B.
dc.creatorLaue, F.
dc.creatorNaumann, L.
dc.creatorOeschler, H.
dc.creatorPuehlhofer, F.
dc.creatorSchwab, E.
dc.creatorSenger, P.
dc.creatorShin, Y.
dc.creatorStroebele, H.
dc.creatorSturm, C.
dc.creatorSurowka, G.
dc.creatorUhlig, F.
dc.creatorWagner, A.
dc.creatorWalus, W.
dc.date2000-10-23
dc.date.accessioned2026-07-07T12:03:58Z
dc.date.available2026-07-07T12:03:58Z
dc.descriptionDifferential 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.
dc.description16 pages, 3 figures, accepted for publication in Physics Letters B
dc.identifierhttps://arxiv.org/abs/nucl-ex/0010013
dc.identifierhttp://arxiv.org/abs/nucl-ex/0010013
dc.identifierPhys.Lett.B495:26-32,2000
dc.identifierdoi:10.1016/S0370-2693(00)01232-6
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/207975
dc.subjectNuclear Experiment
dc.titleFirst Measurement of Antikaon Phase-Space Distributions in Nucleus-Nucleus Collisions at Subthreshold Beam Energies
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