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First evidence for different freeze-out conditions for kaons and antikaons observed in heavy-ion collisions

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arxiv nucl-ex/0307017 v2 pith:Y2ZKJS7A submitted 2003-07-21 nucl-ex

A. Foerster , F. Uhlig , I. Boettcher , M. Debowski , F. Dohrmann , E. Grosse , P. Koczon , B. Kohlmeyer
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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
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keywords mesonscollisionsagevantikaonsbeambeencentralitycollision
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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.

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