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27 April 2024

» arxiv » nucl-ex/0010013

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First Measurement of Antikaon Phase-Space Distributions in Nucleus-Nucleus Collisions at Subthreshold Beam Energies
M. Menzel ; I. Boettcher ; M. Debowski ; F. Dohrmann ; A. Foerster ; E. Grosse ; P. Koczon ; B. Kohlmeyer ; F. Laue ; L. Naumann ; H. Oeschler ; F. Puehlhofer ; E. Schwab ; P. Senger ; Y. Shin ; H. Stroebele ; C. Sturm ; G. Surowka ; F. Uhlig ; A. Wagner ; W. Walus ;
Date:	23 Oct 2000
Journal:	Phys.Lett. B495 (2000) 26-32
Subject:	nucl-ex
Affiliation:	KaoS Collaboration
Abstract:	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.
Source:	arXiv, nucl-ex/0010013
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