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24 April 2024

» pubmed » pmid14611460

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First evidence for different freeze-out conditions for kaons and antikaons observed in heavy-ion collisions
A Förster ; F Uhlig ; I Böttcher ; M Debowski ; F Dohrmann ; E Grosse ; P Koczo? ; B Kohlmeyer ; F Laue ; M Menzel ; L Naumann ; H Oeschler ; W Scheinast ; E Schwab ; P Senger ; Y Shin ; H Ströbele ; C Sturm ; G Surówka ; A Wagner ; W Walu? ; ;
Date:	10 Oct 2003
Journal:	Phys Rev Lett, 91 (15), 152301
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 A GeV. 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:	PubMed, pmid14611460
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