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Förster, A; Uhlig, F; Böttcher, I; Debowski, M; Dohrmann, F; Grosse, E; Koczoń, P; Kohlmeyer, B; Laue, F; Menzel, M; Naumann, L; Oeschler, H; Scheinast, W; Schwab, E; Senger, P; Shin, Y; Ströbele, H; Sturm, C; Surówka, G; Wagner, A; Waluś, W
Physical review letters, 10/2003, Volume: 91, Issue: 15Journal Article
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.
