title: First evidence for different freeze-out conditions for kaons and antikaons observed in heavy-ion collisions.
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.
authors: Technische Universität, Darmstadt, D-64289 Darmstadt, Germany.
authors: A
authors: A
authors: Förster
authors: F
authors: F
authors: Uhlig
authors: I
authors: I
authors: Böttcher
authors: M
authors: M
authors: Debowski
authors: F
authors: F
authors: Dohrmann
authors: E
authors: E
authors: Grosse
authors: P
authors: P
authors: Koczoń
authors: B
authors: B
authors: Kohlmeyer
authors: F
authors: F
authors: Laue
authors: M
authors: M
authors: Menzel
authors: L
authors: L
authors: Naumann
authors: H
authors: H
authors: Oeschler
authors: W
authors: W
authors: Scheinast
authors: E
authors: E
authors: Schwab
authors: P
authors: P
authors: Senger
authors: Y
authors: Y
authors: Shin
authors: H
authors: H
authors: Ströbele
authors: C
authors: C
authors: Sturm
authors: G
authors: G
authors: Surówka
authors: A
authors: A
authors: Wagner
authors: W
authors: W
authors: Waluś