First evidence for different freeze-out conditions for kaons and antikaons observed in heavy-ion collisions.
Phys Rev Lett
; 91(15): 152301, 2003 Oct 10.
Article
em En
| MEDLINE
| ID: mdl-14611460
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.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2003
Tipo de documento:
Article