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23 April 2024

» arxiv » nucl-ex/0307017

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First evidence for different freeze-out conditions for kaons and antikaons observed in heavy-ion collisions
A. Foerster ; F. Uhlig ; I. Boettcher ; M. Debowski ; F. Dohrmann ; E. Grosse ; P. Koczon ; B. Kohlmeyer ; F. Laue ; M. Menzel ; L. Naumann ; H. Oeschler ; W. Scheinast ; E. Schwab ; P. Senger ; Y. Shin ; H. Stroebele ; C. Sturm ; G. Surowka ; A. Wagner ; W. Walus ;
Date:	21 Jul 2003
Journal:	Phys.Rev.Lett. 91 (2003) 152301
Subject:	nucl-ex
Abstract:	Differential production cross sections of K- and K+ mesons have been measured in Ni+Ni and Au+Au collisions at a beam energy of 1.5 AGeV. The K-/K+ ratio is found to be nearly constant as a function of the collision centrality and system size. The spectral slopes and the polar emission pattern differ for K- and K+ mesons. These observations indicate that K+ mesons decouple earlier from the fireball than K- mesons.
Source:	arXiv, nucl-ex/0307017
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