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

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

2003-07-21

arxiv.org/abs/nucl-ex/0307017v2

Phys.Rev.Lett.91:152301,2003

Physics

Nuclear Physics

Nuclear Experiment

accepted by PRL, 12 pages, 4 figures, v2 shortened by 25 lines due to page restrictions

Scientific paper

10.1103/PhysRevLett.91.152301

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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