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27 April 2024

» arxiv » nucl-ex/0701014

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Production of K+ and of K- Mesons in Heavy-Ion Collisions from 0.6 to 2.0 AGeV Incident Energy
A. Foerster ; F. Uhlig ; I. Boettcher ; D. Brill ; M. Debowski ; F. Dohrmann ; E. Grosse ; P. Koczon ; B. Kohlmeyer ; S. Lang ; F. Laue ; M. Mang ; M. Menzel ; C. Muentz ; L. Naumann ; H. Oeschler ; M. Ploskon ; W. Scheinast ; A. Schmah ; T. J. Schuck ; E. Schwab ; P. Senger ; Y. Shin ; J. Speer ; H. Stroebele ; C. Sturm ; G. Surowka ; A. Wagner ; W. Walus ;
Date:	8 Jan 2007
Abstract:	This paper summarizes the yields and the emission patterns of K+ and of K- mesons measured in inclusive C+C, Ni+Ni and Au+Au collisions at incident energies from 0.6 AGeV to 2.0 AGeV using the Kaon Spectrometer KaoS at GSI. For Ni+Ni collisions at 1.5 and at 1.93 AGeV as well as for Au+Au at 1.5 AGeV detailed results of the multiplicities, of the inverse slope parameters of the energy distributions and of the anisotropies in the angular emission patterns as a function of the collision centrality are presented. When comparing transport-model calculations to the measured K+ production yields an agreement is only obtained for a soft nuclear equation of state (compression modulus KN ~ 200 MeV). The production of K- mesons at energies around 1 to 2 AGeV is dominated by the strangeness-exchange reaction K- N <-> pi Y (Y = Lambda, Sigma) which leads to a coupling between the K- and the K+ yields. However, both particle species show distinct differences in their emission patterns suggesting different freeze-out conditions for K+ and for K- mesons.
Source:	arXiv, nucl-ex/0701014
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